Release v1.31.0: Add tunnel-doctor skill

- Add tunnel-doctor v1.0.0: diagnose and fix Tailscale + proxy/VPN route conflicts on macOS
- 6-step diagnostic workflow, per-tool fix guides (Shadowrocket/Clash/Surge)
- Tailscale SSH ACL config and WSL snap vs apt guidance
- Update marketplace to v1.31.0, skills count 35 → 36

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

.claude-plugin/marketplace.json

@@ -6,7 +6,7 @@
   },
   "metadata": {
     "description": "Professional Claude Code skills for GitHub operations, document conversion, diagram generation, statusline customization, Teams communication, repomix utilities, skill creation, CLI demo generation, LLM icon access, Cloudflare troubleshooting, UI design system extraction, professional presentation creation, YouTube video downloading, secure repomix packaging, ASR transcription correction, video comparison quality analysis, comprehensive QA testing infrastructure, prompt optimization with EARS methodology, session history recovery, documentation cleanup, format-controlled deep research report generation with evidence tracking, PDF generation with Chinese font support, CLAUDE.md progressive disclosure optimization, CCPM skill registry search and management, Promptfoo LLM evaluation framework, iOS app development with XcodeGen and SwiftUI, fact-checking with automated corrections, Twitter/X content fetching, intelligent macOS disk space recovery, skill quality review and improvement, GitHub contribution strategy, complete internationalization/localization setup, plugin/skill troubleshooting with diagnostic tools, and evidence-based competitor analysis with source citations",
-    "version": "1.30.0",
+    "version": "1.31.0",
     "homepage": "https://github.com/daymade/claude-code-skills"
   },
   "plugins": [
@@ -729,6 +729,30 @@
       "skills": [
         "./competitors-analysis"
       ]
+    },
+    {
+      "name": "tunnel-doctor",
+      "description": "Diagnose and fix route conflicts between Tailscale and proxy/VPN tools (Shadowrocket, Clash, Surge) on macOS. Use when Tailscale ping works but SSH/TCP times out, when proxy tools hijack the 100.64.0.0/10 CGNAT range, or when setting up Tailscale SSH to WSL instances",
+      "source": "./",
+      "strict": false,
+      "version": "1.0.0",
+      "category": "developer-tools",
+      "keywords": [
+        "tailscale",
+        "vpn",
+        "shadowrocket",
+        "clash",
+        "surge",
+        "route-conflict",
+        "wsl",
+        "ssh",
+        "proxy",
+        "networking",
+        "macos"
+      ],
+      "skills": [
+        "./tunnel-doctor"
+      ]
     }
   ]
 }