Release v3: Modernize boilerplate with sqlx, middleware, reusable validation, and invoice PDF · Massad/gin-boilerplate

What's new in v3

sqlx migration: Replaced go-gorp with sqlx for a thinner database layer. All raw SQL queries unchanged.
Middleware extraction: Moved CORS, RequestID, and JWT auth middleware from main.go into middleware/ package. Auth middleware calls models directly to avoid import cycles.
Reusable form validation: Replaced duplicated per-field error methods with a single forms.Translate(err, messages) function and declarative message maps.
Invoice example: Added invoice/ package with HTML preview and PDF download using maroto (pure Go, no external binaries).
Dependency upgrades: gin 1.11, crypto 0.49, validator 10.28, gzip 1.2.5, swag 1.16.6. Removed go-gorp.
README refreshed for v3 with API endpoint table, project structure, and new sections for invoice demo, trusted proxies, and CORS.

Authorization bypass fixed: Article Update/Delete now enforce user_id in SQL queries (previously any authenticated user could modify any article by ID).
DB SSL: PostgreSQL connection respects SSL env var (sslmode=require when SSL=TRUE).
Logout route: Now uses TokenAuth middleware for consistent 401 responses.
Login error handling: CreateAuth failure now returns error instead of silently issuing unusable tokens.
Token validation: ExtractTokenMetadata returns explicit errors instead of nil, nil on invalid claims.
Test credential leak: Removed fmt.Println(DB_PASS) from test output.
Trusted proxies: Added SetTrustedProxies(nil) to prevent proxy header trust warning.