Add halo-theme-dev skill & theme templates

Add a new .agents/skills/halo-theme-dev skill providing Halo theme development resources: two theme templates (theme-vite and theme-minimal) with theme.yaml/settings, Vite config, package.json, CSS and JS assets, and a full set of Thymeleaf template files/partials. Include comprehensive reference docs (structure & config, finder APIs, global variables, annotations, static resources, packaging, official plugins, thymeleaf tips) and an agents/openai.yaml interface. Also update project files: modify package.json, update tsconfig.json, add skills-lock.json, rename vite-env.d.ts and remove obsolete src/main.ts and src/styles/main.css while populating src/ with the new template files.

.agents/skills/halo-theme-dev/assets/theme-vite/package.json

@@ -0,0 +1,14 @@
+{
+  "type": "module",
+  "scripts": {
+    "dev": "vite build --watch",
+    "build": "vite build && theme-package",
+    "build-only": "vite build"
+  },
+  "devDependencies": {
+    "@halo-dev/theme-package-cli": "^1.0.1",
+    "@halo-dev/vite-plugin-halo-theme": "latest",
+    "vite": "^8.0.0"
+  },
+  "packageManager": "pnpm@10.33.0"
+}