Release/v0.0.7 (#151)

* chore(assets): update wechat_group image file

* Refactor code structure for improved readability and maintainability

* feat(backends): enhance MergedReadOnlyBackend with improved ls, grep, and glob methods

* fix(docs): update WeChat QR code image link in README files

* feat(skills): enhance skill management to support global and workspace tiers

* style: apply ruff format to skills_cmd and commands/implementation/skills

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(skills): improve uninstall_skill to prevent removal of built-in skills

* fix(docs): update skill installation documentation for clarity on global and user directories

* fix(skills): enhance uninstall_skill to validate skill directory before removal

* fix(skills): improve error handling in install_skill and uninstall_skill for directory creation and validation

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/assets/badge-pypi-dark.svg

@@ -5,5 +5,5 @@
   <rect x="54" y="5" width="62" height="24" rx="6" fill="#1565c0"/>
   <text x="85" y="22" text-anchor="middle"
         font-family="Inter, -apple-system, system-ui, sans-serif"
-        font-size="13" font-weight="700" fill="#ffffff">v0.0.6</text>
+        font-size="13" font-weight="700" fill="#ffffff">v0.0.7</text>
 </svg>

.github/assets/badge-pypi-light.svg

@@ -5,5 +5,5 @@
   <rect x="54" y="5" width="62" height="24" rx="6" fill="#2563eb"/>
   <text x="85" y="22" text-anchor="middle"
         font-family="Inter, -apple-system, system-ui, sans-serif"
-        font-size="13" font-weight="700" fill="#ffffff">v0.0.6</text>
+        font-size="13" font-weight="700" fill="#ffffff">v0.0.7</text>
 </svg>