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/theme.yaml

@@ -0,0 +1,20 @@
+apiVersion: theme.halo.run/v1alpha1
+kind: Theme
+metadata:
+  name: theme-vite
+spec:
+  displayName: Vite Theme
+  author:
+    name: Your Name
+    website: https://example.com
+  description: A Halo theme powered by vite-plugin-halo-theme
+  logo: ""
+  homepage: ""
+  repo: ""
+  issues: ""
+  settingName: "theme-vite-setting"
+  configMapName: "theme-vite-configmap"
+  version: 1.0.0
+  requires: ">=2.0.0"
+  license:
+    - name: "MIT"