chore: v0.13.1 release prep — fix fake update, cleanup hot update, version bump

1. main.js: import package.json → __APP_VERSION__ (统一版本来源)
2. dev-api.js: check_panel_update 实现 GitHub/Gitee API 查询
   (与 Rust 端逻辑一致，Web 模式可正常检测新版本)
3. dev-api.js: 移除 check_hermes 中未使用的 enhanced 变量
4. i18n: 清理 14 个废弃的热更新相关翻译键
5. 版本号升级: 0.13.0 → 0.13.1
   (package.json, Cargo.toml, tauri.conf.json)

src-tauri/Cargo.lock

@@ -351,7 +351,7 @@ dependencies = [
 
 [[package]]
 name = "clawpanel"
-version = "0.13.0"
+version = "0.13.1"
 dependencies = [
  "base64 0.22.1",
  "chrono",

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "clawpanel"
-version = "0.13.0"
+version = "0.13.1"
 edition = "2021"
 description = "ClawPanel - OpenClaw 可视化管理面板"
 authors = ["qingchencloud"]

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://raw.githubusercontent.com/tauri-apps/tauri/dev/crates/tauri-config-schema/schema.json",
   "productName": "ClawPanel",
-  "version": "0.13.0",
+  "version": "0.13.1",
   "identifier": "ai.openclaw.clawpanel",
   "build": {
     "frontendDist": "../dist",