feat: 全局设置系统 — settings 表、CRUD 路由、主题偏好持久化

src/server/routes/settings.ts

@@ -0,0 +1,38 @@
+import type Database from "bun:sqlite";
+
+import type { RuntimeMode, SettingsData } from "../../shared/api";
+import type { Logger } from "../logger";
+
+import { getSettings, updateSettings } from "../db/settings";
+import { createApiError, jsonResponse } from "../helpers";
+
+export function handleGetSettings(_req: Request, db: Database, mode: RuntimeMode, _logger: Logger): Response {
+  const data = getSettings(db);
+  return jsonResponse(data, { mode });
+}
+
+export async function handleUpdateSettings(
+  req: Request,
+  db: Database,
+  mode: RuntimeMode,
+  logger: Logger,
+): Promise<Response> {
+  let body: Partial<SettingsData>;
+  try {
+    body = (await req.json()) as Partial<SettingsData>;
+  } catch {
+    return jsonResponse(createApiError("Invalid JSON body", 400), { mode, status: 400 });
+  }
+
+  if (body.theme !== undefined && typeof body.theme !== "string") {
+    return jsonResponse(createApiError("theme must be a string", 400), { mode, status: 400 });
+  }
+
+  if (body.theme !== undefined && body.theme !== "dark" && body.theme !== "light" && body.theme !== "system") {
+    return jsonResponse(createApiError("theme 仅支持 dark、light、system", 400), { mode, status: 400 });
+  }
+
+  const result = updateSettings(db, body, logger);
+  logger.info({ data: result }, "设置已更新");
+  return jsonResponse(result, { mode });
+}