Add structured HTTP request logging and increase timeouts

- Replace chi's Logger middleware with structured slog-based logging
- Log request start (debug) and completion (info/warn/error by status)
- Include method, path, status, duration_ms, remote_addr in logs
- Increase request timeout from 8s to 30s for slow queries
- Add read/write/idle timeouts to HTTP server config
- Better server startup logging to confirm listening state

internal/server/routes.go

@@ -14,9 +14,9 @@ func (s *Server) setupRoutes() {
 	// Middleware
 	r.Use(middleware.RequestID)
 	r.Use(middleware.RealIP)
-	r.Use(middleware.Logger)
+	r.Use(RequestLoggerMiddleware(s.logger.Logger)) // Structured request logging
 	r.Use(middleware.Recoverer)
-	const requestTimeout = 8 * time.Second
+	const requestTimeout = 30 * time.Second // Increased from 8s for slow queries
 	r.Use(TimeoutMiddleware(requestTimeout))
 	r.Use(JSONResponseMiddleware)