feat: debounce search, tambah filter source & date range di bug-reports, hapus seafile.ts

- Debounce search input (400ms, min 3 karakter) sesuai konvensi
- Tambah filter source (QC/SYSTEM/USER) dan date range di bug-reports
- Backend /api/bugs support query param source, dateFrom, dateTo
- Update API_URLS.getBugs dengan param baru
- Hapus seafile.ts (dead code, tidak digunakan)

src/frontend/config/api.ts

@@ -51,8 +51,13 @@ export const API_URLS = {
   createOperator: () => `/api/operators`,
   editOperator: (id: string) => `/api/operators/${id}`,
   deleteOperator: (id: string) => `/api/operators/${id}`,
-  getBugs: (page: number, search: string, app: string, status: string) => 
-    `/api/bugs?page=${page}&search=${encodeURIComponent(search)}&app=${app}&status=${status}`,
+  getBugs: (page: number, search: string, app: string, status: string, source?: string, dateFrom?: string, dateTo?: string) => {
+    const params = new URLSearchParams({ page: String(page), search: encodeURIComponent(search), app, status })
+    if (source && source !== 'all') params.set('source', source)
+    if (dateFrom) params.set('dateFrom', dateFrom)
+    if (dateTo) params.set('dateTo', dateTo)
+    return `/api/bugs?${params}`
+  },
   createBug: () => `/api/bugs`,
   uploadImage: () => `/api/upload/image`,
   updateBugStatus: (id: string) => `/api/bugs/${id}/status`,