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/android/app/build.gradle

@@ -7,10 +7,10 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    namespace "com.aimloperations.chat"
+    namespace "ai.hesychia.chat"
     compileSdk rootProject.ext.compileSdkVersion
     defaultConfig {
-        applicationId "com.aimloperations.chat"
+        applicationId "ai.hesychia.chat"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1