Add Android control app and embedded server

Inspired by HNKServer/honoka-chan-apk-server, but implemented as a JNI-based embedded runtime instead of the original approach.

- Add an Android Compose controller app that starts and stops honoka-chan through JNI, shows runtime and health status, manages data directory mounting, and supports backup import/export for data.db
- Add an embeddable Go server entrypoint plus JNI-exported status, health, and reload hooks so desktop and Android builds share the same startup and shutdown path
- Add Android build scripts, runtime packaging, and project documentation, including generated default config.json content for honoka_runtime.zip
- Add runtime bundle hash tracking so updated honoka_runtime.zip assets are automatically redeployed while preserving config.json and user data files
- Add in-app service settings for unlock_all_special_rotation with immediate config persistence and automatic reload when the service is running
- Split SQLite driver selection by platform, using go-sqlite3 on Android and modernc.org/sqlite elsewhere to avoid Android x86_64 seccomp crashes
- Update startup, database initialization, and system health/reload handlers to support the embedded runtime and Android control flow

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/startup/startup.go

@@ -1,8 +1,17 @@
 package startup
 
-func StartUp() {
-	CreateTables()
-	LoadUnitData()
-	CreateDefaultUser()
-	EnsureDefaultFriends()
+func StartUp() error {
+	if err := CreateTables(); err != nil {
+		return err
+	}
+	if err := LoadUnitData(); err != nil {
+		return err
+	}
+	if err := CreateDefaultUser(); err != nil {
+		return err
+	}
+	if err := EnsureDefaultFriends(); err != nil {
+		return err
+	}
+	return nil
 }