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>

config/config.go

@@ -12,6 +12,7 @@ var (
 	Conf = &AppConfigs{}
 
 	PackageVersion = "97.4.6"
+	ConfigPath     = "./config.json"
 
 	PrivateKeyPath = "assets/certs/privatekey.pem"
 	PublicKeyPath  = "assets/certs/publickey.pem"
@@ -25,11 +26,17 @@ type AppConfigs struct {
 type Settings struct {
 	ListenPort               string `json:"listen_port"`
 	CdnServer                string `json:"cdn_server"`
+	ReloadToken              string `json:"reload_token"`
 	UnlockAllSpecialRotation bool   `json:"unlock_all_special_rotation"`
 }
 
 func InitConfig() {
-	Conf = Load("./config.json")
+	ReloadConfig()
+}
+
+func ReloadConfig() *AppConfigs {
+	Conf = Load(ConfigPath)
+	return Conf
 }
 
 func DefaultConfigs() *AppConfigs {
@@ -38,6 +45,7 @@ func DefaultConfigs() *AppConfigs {
 		Settings: Settings{
 			ListenPort:               "8080",
 			CdnServer:                "http://127.0.0.1:8080/static",
+			ReloadToken:              "",
 			UnlockAllSpecialRotation: false,
 		},
 	}