feat(rules): add vue and nuxt rule sets (#2250)

* feat(rules): add vue and nuxt rule sets

Add rules/vue/ and rules/nuxt/, each with the standard 5-file layout (coding-style, hooks, patterns, security, testing) that extends common/, following the Adding a New Language convention in rules/README.md.

Vue rules reference the frontend-patterns and vite-patterns skills. Nuxt rules reference the nuxt4-patterns and vite-patterns skills. Content is concise (1.5 to 4 KB per file) since rules load as always-on context.

* fix(rules): address PR review on vue and nuxt rule sets

- nuxt/coding-style: generalize the srcDir-override note (drop project-specific 'this repo' phrasing so it is correct for any Nuxt project).

- vue/hooks: add **/*.ts and **/*.tsx to paths so the lint/typecheck guidance loads when editing composables and stores.

- nuxt/hooks: add **/*.vue to paths (covers pages/layouts/components) and wrap nuxi typecheck in a timeout, mirroring web/hooks.md.

- nuxt/security: tighten the /security-review auto-trigger scope to external fetch, credential handling, and sensitive mutations, with examples.

- nuxt/testing: correct 'Vitest-only' to note built-in Playwright E2E, and drop the @nuxt/test-utils version pin.

- README: register vue and nuxt in the structure tree and install examples.

Skipped: 'X specific' -> 'X-specific' hyphenation (all existing rule sets use the unhyphenated form, changing only vue/nuxt would be inconsistent); repeating the 80%/TDD mandate in nuxt/testing (already inherited from common/testing.md).

rules/README.md

@@ -16,6 +16,8 @@ rules/
 │   └── security.md
 ├── typescript/      # TypeScript/JavaScript specific
 ├── angular/         # Angular specific
+├── vue/             # Vue 3 specific
+├── nuxt/            # Nuxt 4 specific
 ├── python/          # Python specific
 ├── golang/          # Go specific
 ├── web/             # Web and frontend specific
@@ -36,6 +38,8 @@ rules/
 # Install common + one or more language-specific rule sets
 ./install.sh typescript
 ./install.sh angular
+./install.sh vue
+./install.sh nuxt
 ./install.sh python
 ./install.sh golang
 ./install.sh web
@@ -70,6 +74,8 @@ cp -r rules/common ~/.claude/rules/ecc/
 # Install language-specific rules based on your project's tech stack
 cp -r rules/typescript ~/.claude/rules/ecc/
 cp -r rules/angular ~/.claude/rules/ecc/
+cp -r rules/vue ~/.claude/rules/ecc/
+cp -r rules/nuxt ~/.claude/rules/ecc/
 cp -r rules/python ~/.claude/rules/ecc/
 cp -r rules/golang ~/.claude/rules/ecc/
 cp -r rules/web ~/.claude/rules/ecc/