feat: add Google Sign-In with JWT auth and Neon DB persistence

internal/config/config.go

@@ -19,6 +19,8 @@ type Config struct {
 	ModelKey        string
 	ImageModelKey   string
 	ThirdOneBin     string
+	GoogleClientID  string
+	JWTSecret       string
 }
 
 func LoadFromEnv() Config {
@@ -30,6 +32,8 @@ func LoadFromEnv() Config {
 		ModelKey:        envOrDefault("TUTOR_MODEL_KEY", defaultModelKey),
 		ImageModelKey:   envOrDefault("TUTOR_IMAGE_MODEL_KEY", defaultImageModelKey),
 		ThirdOneBin:     envOrDefault("THIRDONE_BIN", defaultThirdOneBin),
+		GoogleClientID:  envOrDefault("GOOGLE_CLIENT_ID", ""),
+		JWTSecret:       envOrDefault("JWT_SECRET", ""),
 	}
 }