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>

android/scripts/prepare_runtime_zip.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/common.sh"
+
+require_cmd zip
+
+ZIP_PATH="$ANDROID_DIR/app/src/main/assets/honoka_runtime.zip"
+
+cd "$PROJECT_ROOT"
+
+ensure_file "$PROJECT_ROOT/assets/main.db"
+
+TMP_DIR="$(mktemp -d)"
+trap 'rm -rf "$TMP_DIR"' EXIT
+
+mkdir -p "$TMP_DIR/assets" "$TMP_DIR/static"
+
+log "collecting runtime files"
+
+cat > "$TMP_DIR/config.json" <<'EOF'
+{
+	"app_name": "honoka-chan",
+	"settings": {
+		"listen_port": "8080",
+		"cdn_server": "http://127.0.0.1:8080/static",
+		"reload_token": "",
+		"unlock_all_special_rotation": false
+	}
+}
+EOF
+
+cp -r "$PROJECT_ROOT/assets/main.db" "$TMP_DIR/assets/main.db"
+
+for path in \
+  "assets/serverdata" \
+  "assets/certs" \
+  "static/templates" \
+  "static/css" \
+  "static/js" \
+  "static/images" \
+  "static/font"
+do
+  if [[ -e "$PROJECT_ROOT/$path" ]]; then
+    mkdir -p "$TMP_DIR/$(dirname "$path")"
+    cp -r "$PROJECT_ROOT/$path" "$TMP_DIR/$path"
+  fi
+done
+
+rm -f "$ZIP_PATH"
+
+log "packing $ZIP_PATH"
+(
+  cd "$TMP_DIR"
+  zip -qr "$ZIP_PATH" assets static config.json
+)
+
+log "runtime zip ready: $ZIP_PATH"