Implement settings service and routes for file-based settings management

- Add SettingsService to handle reading/writing global and project settings.
- Introduce API routes for managing settings, including global settings, credentials, and project-specific settings.
- Implement migration functionality to transfer settings from localStorage to file-based storage.
- Create common utilities for settings routes and integrate logging for error handling.
- Update server entry point to include new settings routes.

apps/server/src/routes/settings/index.ts

@@ -0,0 +1,38 @@
+/**
+ * Settings routes - HTTP API for persistent file-based settings
+ */
+
+import { Router } from "express";
+import type { SettingsService } from "../../services/settings-service.js";
+import { createGetGlobalHandler } from "./routes/get-global.js";
+import { createUpdateGlobalHandler } from "./routes/update-global.js";
+import { createGetCredentialsHandler } from "./routes/get-credentials.js";
+import { createUpdateCredentialsHandler } from "./routes/update-credentials.js";
+import { createGetProjectHandler } from "./routes/get-project.js";
+import { createUpdateProjectHandler } from "./routes/update-project.js";
+import { createMigrateHandler } from "./routes/migrate.js";
+import { createStatusHandler } from "./routes/status.js";
+
+export function createSettingsRoutes(settingsService: SettingsService): Router {
+  const router = Router();
+
+  // Status endpoint (check if migration needed)
+  router.get("/status", createStatusHandler(settingsService));
+
+  // Global settings
+  router.get("/global", createGetGlobalHandler(settingsService));
+  router.put("/global", createUpdateGlobalHandler(settingsService));
+
+  // Credentials (separate for security)
+  router.get("/credentials", createGetCredentialsHandler(settingsService));
+  router.put("/credentials", createUpdateCredentialsHandler(settingsService));
+
+  // Project settings
+  router.post("/project", createGetProjectHandler(settingsService));
+  router.put("/project", createUpdateProjectHandler(settingsService));
+
+  // Migration from localStorage
+  router.post("/migrate", createMigrateHandler(settingsService));
+
+  return router;
+}