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>

cmd/honoka-android/main.go

@@ -0,0 +1,68 @@
+package main
+
+/*
+#include <stdlib.h>
+*/
+import "C"
+
+import (
+	"context"
+	"encoding/json"
+	"honoka-chan/internal/app"
+	systemhandler "honoka-chan/internal/handler/system"
+	"time"
+	"unsafe"
+)
+
+//export ServerStart
+func ServerStart(workDir *C.char) *C.char {
+	if err := app.Start(C.GoString(workDir)); err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
+
+//export ServerStop
+func ServerStop() *C.char {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := app.Stop(ctx); err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
+
+//export ServerStatusJSON
+func ServerStatusJSON() *C.char {
+	return C.CString(app.GetStatusJSON())
+}
+
+//export ServerHealthJSON
+func ServerHealthJSON() *C.char {
+	return C.CString(systemhandler.HealthJSON())
+}
+
+//export ServerReload
+func ServerReload() *C.char {
+	resp, _, err := systemhandler.Reload("", false)
+	if err == nil {
+		return nil
+	}
+
+	data, marshalErr := json.Marshal(resp)
+	if marshalErr != nil {
+		return C.CString(err.Error())
+	}
+	return C.CString(string(data))
+}
+
+//export ServerFreeString
+func ServerFreeString(str *C.char) {
+	if str == nil {
+		return
+	}
+	C.free(unsafe.Pointer(str))
+}
+
+func main() {}