fix: improve logging and error visibility, move Story 1.7 to Epic 2

Fixes:
- Added database connection logging with masked DSN
- Added migration progress logging
- Added HTTP server startup logging with address
- Fixed database provider to accept logger parameter
- Improved error visibility throughout initialization

Documentation:
- Moved Story 1.7 (Service Client Interfaces) to Epic 2 as Story 2.7
- Updated Epic 1 and Epic 2 READMEs
- Updated COMPLETE_TASK_LIST.md
- Updated story metadata (ID, Epic, Dependencies)

These changes will help diagnose startup issues and provide better visibility into what the application is doing.

internal/di/providers.go

@@ -67,7 +67,7 @@ func ProvideLogger() fx.Option {
 
 // ProvideDatabase creates an FX option that provides the database client.
 func ProvideDatabase() fx.Option {
-	return fx.Provide(func(cfg config.ConfigProvider, lc fx.Lifecycle) (*database.Client, error) {
+	return fx.Provide(func(cfg config.ConfigProvider, log logger.Logger, lc fx.Lifecycle) (*database.Client, error) {
 		dsn := cfg.GetString("database.dsn")
 		if dsn == "" {
 			return nil, fmt.Errorf("database DSN is not configured")
@@ -108,9 +108,11 @@ func ProvideDatabase() fx.Option {
 		lc.Append(fx.Hook{
 			OnStart: func(ctx context.Context) error {
 				// Run migrations on startup
+				log.Info("Running database migrations...")
 				if err := dbClient.Migrate(ctx); err != nil {
 					return fmt.Errorf("failed to run database migrations: %w", err)
 				}
+				log.Info("Database migrations completed successfully")
 				return nil
 			},
 			OnStop: func(ctx context.Context) error {
@@ -225,8 +227,22 @@ func ProvideHTTPServer() fx.Option {
 		// Register lifecycle hooks
 		lc.Append(fx.Hook{
 			OnStart: func(ctx context.Context) error {
+				// Get server address from config
+				port := cfg.GetInt("server.port")
+				if port == 0 {
+					port = 8080
+				}
+				host := cfg.GetString("server.host")
+				if host == "" {
+					host = "0.0.0.0"
+				}
+				addr := fmt.Sprintf("%s:%d", host, port)
+				
 				// Start server in a goroutine
 				go func() {
+					log.Info("HTTP server starting",
+						logger.String("addr", addr),
+					)
 					if err := srv.Start(); err != nil && err != http.ErrServerClosed {
 						log.Error("HTTP server error",
 							logger.String("error", err.Error()),
@@ -259,6 +275,32 @@ func CoreModule() fx.Option {
 	)
 }
 
+// maskDSN masks sensitive information in DSN for logging.
+func maskDSN(dsn string) string {
+	// Simple masking: replace password with ***
+	// Format: postgres://user:password@host:port/db
+	if len(dsn) < 20 {
+		return "***"
+	}
+	// Find @ symbol and replace password part
+	if idx := indexOf(dsn, '@'); idx > 0 {
+		if colonIdx := indexOf(dsn[:idx], ':'); colonIdx > 0 {
+			return dsn[:colonIdx+1] + "***" + dsn[idx:]
+		}
+	}
+	return "***"
+}
+
+// indexOf finds the index of a character in a string.
+func indexOf(s string, c byte) int {
+	for i := 0; i < len(s); i++ {
+		if s[i] == c {
+			return i
+		}
+	}
+	return -1
+}
+
 // RegisterLifecycleHooks registers lifecycle hooks for logging.
 func RegisterLifecycleHooks(lc fx.Lifecycle, l logger.Logger) {
 	lc.Append(fx.Hook{