Rename Android application ID to ai.hesychia.chat (#68)

## Summary
- Closes #67
- Renames Android/Capacitor identity from `com.aimloperations.chat` → `ai.hesychia.chat`
- Updates `appId`, Gradle `applicationId`/`namespace`, `MainActivity` package path, `strings.xml` scheme, and Android README

## Notes
- New application ID installs as a separate app beside any old-ID install (expected for early builds).
- App already built and run on a physical device with this identity work in progress.

## Test plan
- [ ] `npx cap sync android` after web build
- [ ] Debug install on device — package shows `ai.hesychia.chat`
- [ ] App launches and reaches login / chat
- [ ] Confirm old `com.aimloperations.chat` install (if present) is separate and can be uninstalledReviewed-on: #68

llm-fe/capacitor.config.ts

@@ -1,7 +1,7 @@
 import type { CapacitorConfig } from '@capacitor/cli';
 
 const config: CapacitorConfig = {
-  appId: 'com.aimloperations.chat',
+  appId: 'ai.hesychia.chat',
   appName: 'Hesychia',
   webDir: 'build',
   server: {