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/defaultuser.go

@@ -1,6 +1,7 @@
 package startup
 
 import (
+	"fmt"
 	"honoka-chan/internal/handler/ghome/account"
 	usermodel "honoka-chan/internal/model/user"
 	"log"
@@ -10,16 +11,17 @@ const (
 	defaultPassword = "klsbgames"
 )
 
-func CreateDefaultUser() {
+func CreateDefaultUser() error {
 	_, code, msg, created, err := account.AddUser(usermodel.DefaultSystemPhone, defaultPassword, true)
 	if err != nil {
-		log.Fatalln("默认用户创建失败:", err.Error())
+		return fmt.Errorf("默认用户创建失败: %w", err)
 	}
 	if code != 0 {
-		log.Fatalf("默认用户创建失败: code=%d msg=%s", code, msg)
+		return fmt.Errorf("默认用户创建失败: code=%d msg=%s", code, msg)
 	}
 	if created {
 		log.Printf("默认用户创建成功, 账号: %s, 密码: %s\n", usermodel.DefaultSystemPhone, defaultPassword)
-		return
+		return nil
 	}
+	return nil
 }