fix(frontend): align pages with DB schema, fix auth, and improve UX

- Fix auth system: remove redirect bugs in login/register pages, register
  routes, wrap protected routes with AuthGuard, add AuthInitializer
- Add missing navbar links (Diagnosa, Pustaka, expert Review)
- Fix DiagnosesPage status filter to match DB DiagnosisStatus enum,
  support URL params (?status=, ?risk=) from dashboard links
- Replace hardcoded disease data on Dashboard with API-driven data,
  fix layout bugs (invalid gap-57 class, empty Button)
- Rewrite LibraryPage to use API instead of mock-diseases.ts
- Indonesian-ize Expert Reviews page labels and text
- Wrap DiagnosisDetailPage with MainLayout for consistent layout
- Improve ScanPage UX: image preview before upload, lucide icons,
  proper disease names in result modal, file size validation
- Delete dead code: mock-diseases.ts, unused form components,
  tailwind.config.ts (Tailwind v4 does not read v3 config)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

bun.lock

@@ -1,5 +1,6 @@
 {
   "lockfileVersion": 1,
+  "configVersion": 0,
   "workspaces": {
     "": {
       "devDependencies": {