Add a small, tested base for all three clients, and Gitea CI/release workflows

internal/client (new): a typed Go HTTP client for the API - login,
register, logout, me, and full CRUD for games/platforms - shared by the
TUI and the Fyne GUI so request-building, auth and error handling (an
APIError with the HTTP status) live in one tested place instead of being
duplicated. 8 tests against an httptest server covering success, 401, 403
and that the token is stored/cleared at the right times.

cmd/tui (rewrite): drops the old unauthenticated read-only viewer. Now a
login screen (bubbles/textinput) -> a scrollable games table
(bubbles/table) with 'r' to refresh, built as an explicit state machine
(screenLogin/screenLoading/screenGames) so Update's transitions are
testable without a real terminal. 9 tests driving Update() directly.

cmd/gui (rewrite): drops raylib for Fyne. Same shape as the TUI - a login
form, then a games table, with networking on a goroutine and fyne.Do for
the UI updates. The table-cell and login-validation logic are plain
functions with no Fyne/display dependency, so they're tested directly (7
tests) rather than needing Fyne's headless test driver.

internal/api: tagged every operation (Auth/Platforms/Games/Misc) so the
generated OpenAPI spec groups into named services instead of one bucket;
api/openapi.json regenerated. Added CORS middleware (wildcard origin, no
credentials needed since clients use a bearer token, not the cookie) -
needed for the new web client's browser requests to the API's a different
origin.

web/ (new): an Angular 22 + Material app, API client generated from
api/openapi.json via ng-openapi-gen (services: true for per-resource
classes - AuthService/GamesService/PlatformsService - instead of one
generic Api facade). A Session service holds the token/user as signals,
persists the token to localStorage, and is the only thing that calls the
generated AuthService; an HttpInterceptorFn attaches the bearer token to
every request; a CanActivateFn guard protects /games. Login and Games are
standalone, lazy-loaded route components. 21 tests (Vitest, Angular's new
default - no browser/Karma needed) covering the service, interceptor,
guard and both components, run via `npm test` exactly as CI will call it.

Justfile: fixed run-tui/run-gui, which used `go run .../main.go` - broken
now that both packages span multiple files, since that only compiles the
one named file. Added web-install/web-dev/web-build/web-test.

.gitea/workflows/ci.yml (moved from .github, which Gitea doesn't read):
on push to main/develop - gofmt, go vet, go build, go test, go mod tidy
diff (with the Fyne build's system deps installed), sqlc diff, and the
web app's build+test.

.gitea/workflows/release.yml (new): on a vX.Y.Z tag, cross-compiles
api+tui for linux/darwin/windows (amd64+arm64, pure Go, no cgo), builds
the Fyne GUI for linux/amd64 only (cgo + its OpenGL/X11 link means it
can't cross-compile from one Linux runner the way api/tui do, and this
repo has no registered macOS/Windows runner to build it on natively -
documented in the workflow's comments), builds the web app, and creates a
Gitea release with all of it attached via the Gitea API. Written to
Gitea's documented GitHub-Actions-compatible syntax but not executable
from here - there's no Gitea server in this environment to run it
against, unlike everything else in this commit, which was.

Verified: every Go package builds/vets/tests clean; sqlc diff and go mod
tidy -diff are clean; the Angular app builds for production and its test
suite passes via `npm test`/`npm run build` (the exact commands CI runs),
including after a clean `npm ci` from the committed lockfile; the new CORS
config was checked with real preflight and GET requests against a running
server, not just read.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

api/openapi.json

@@ -1 +1 @@
-{"components":{"schemas":{"AuthResponse":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/AuthResponse.json"],"format":"uri","readOnly":true,"type":"string"},"token":{"type":"string"},"user":{"$ref":"#/components/schemas/User"}},"required":["token","user"],"type":"object"},"ErrorDetail":{"additionalProperties":false,"properties":{"location":{"description":"Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id'","type":"string"},"message":{"description":"Error message text","type":"string"},"value":{"description":"The value at the given location"}},"type":"object"},"ErrorModel":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/ErrorModel.json"],"format":"uri","readOnly":true,"type":"string"},"detail":{"description":"A human-readable explanation specific to this occurrence of the problem.","examples":["Property foo is required but is missing."],"type":"string"},"errors":{"description":"Optional list of individual error details","items":{"$ref":"#/components/schemas/ErrorDetail"},"type":["array","null"]},"instance":{"description":"A URI reference that identifies the specific occurrence of the problem.","examples":["https://example.com/error-log/abc123"],"format":"uri","type":"string"},"status":{"description":"HTTP status code","examples":[400],"format":"int64","type":"integer"},"title":{"description":"A short, human-readable summary of the problem type. This value should not change between occurrences of the error.","examples":["Bad Request"],"type":"string"},"type":{"default":"about:blank","description":"A URI reference to human-readable documentation for the error.","examples":["https://example.com/errors/example"],"format":"uri","type":"string"}},"type":"object"},"Game":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/Game.json"],"format":"uri","readOnly":true,"type":"string"},"finished":{"description":"YYYY-MM-DD (optional)","format":"date","type":"string"},"id":{"type":"string"},"name":{"type":"string"},"platform_id":{"type":"string"},"platform_name":{"type":"string"},"release_date":{"description":"YYYY-MM-DD","format":"date","type":"string"},"score":{"format":"int32","type":"integer"}},"required":["id","name","platform_id","platform_name","score","release_date"],"type":"object"},"GameInput":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/GameInput.json"],"format":"uri","readOnly":true,"type":"string"},"finished":{"description":"YYYY-MM-DD (optional)","format":"date","type":"string"},"name":{"minLength":1,"type":"string"},"platform_id":{"type":"string"},"release_date":{"description":"YYYY-MM-DD","format":"date","type":"string"},"score":{"format":"int32","maximum":100,"minimum":0,"type":"integer"}},"required":["name","platform_id","score","release_date"],"type":"object"},"Get-helloResponse":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/Get-helloResponse.json"],"format":"uri","readOnly":true,"type":"string"},"message":{"type":"string"}},"required":["message"],"type":"object"},"LoginInput":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/LoginInput.json"],"format":"uri","readOnly":true,"type":"string"},"email":{"format":"email","type":"string"},"password":{"type":"string"}},"required":["email","password"],"type":"object"},"Platform":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/Platform.json"],"format":"uri","readOnly":true,"type":"string"},"id":{"type":"string"},"name":{"type":"string"}},"required":["id","name"],"type":"object"},"PlatformInput":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/PlatformInput.json"],"format":"uri","readOnly":true,"type":"string"},"name":{"description":"Name of the platform","minLength":1,"type":"string"}},"required":["name"],"type":"object"},"RegisterInput":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/RegisterInput.json"],"format":"uri","readOnly":true,"type":"string"},"email":{"format":"email","type":"string"},"name":{"minLength":1,"type":"string"},"password":{"minLength":8,"type":"string"}},"required":["email","password","name"],"type":"object"},"User":{"additionalProperties":false,"properties":{"$schema":{"description":"Line truncated
+{"components":{"schemas":{"AuthResponse":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/AuthResponse.json"],"format":"uri","readOnly":true,"type":"string"},"token":{"type":"string"},"user":{"$ref":"#/components/schemas/User"}},"required":["token","user"],"type":"object"},"ErrorDetail":{"additionalProperties":false,"properties":{"location":{"description":"Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id'","type":"string"},"message":{"description":"Error message text","type":"string"},"value":{"description":"The value at the given location"}},"type":"object"},"ErrorModel":{"additionalProperties":false,"properties":{"$schema":{"description":"A URL to the JSON Schema for this object.","examples":["https://example.com/schemas/ErrorModel.json"],"format":"uri","readOnly":true,"type":"string"},"detail":{"description":"A human-readable explanation specific to this occurrence of the problem.","examples":["Property foo is required but is missing."],"type":"string"},"errors":{"description":"Optional list of individual error details","items":{"$ref":"#/components/schemas/ErrorDetail"},"type":["array","null"]},"instance":{"description":"A URI reference that identifies the specific occurrence of the problem.","examples":["https://example.com/error-log/abc123"],"format":"uri","type":"string"},"status":{"description":"HTTP status code","examples":[400],"format":"int64","type":"integer"},"title":{"description":"A short, human-readable summary of the problem type. 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