refactor: bundle MCP servers inside plugins for cache compatibility

Claude Code only caches the plugin directory when installed from a
marketplace, not parent directories. This broke the shared mcp-servers/
architecture because relative paths like ../../mcp-servers/ resolved
to non-existent locations in the cache.

Changes:
- Move gitea and wikijs MCP servers into plugins/projman/mcp-servers/
- Move netbox MCP server into plugins/cmdb-assistant/mcp-servers/
- Update .mcp.json files to use ${CLAUDE_PLUGIN_ROOT}/mcp-servers/
- Update setup.sh to handle new bundled structure
- Add netbox.env config template to setup.sh
- Update CLAUDE.md and CANONICAL-PATHS.md documentation

This ensures plugins work correctly when installed and cached.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/projman/mcp-servers/wikijs/requirements.txt

@@ -0,0 +1,19 @@
+# Wiki.js MCP Server Dependencies
+
+# MCP SDK
+mcp>=0.1.0
+
+# HTTP client for GraphQL
+httpx>=0.27.0
+httpx-sse>=0.4.0
+
+# Configuration
+python-dotenv>=1.0.0
+
+# Testing
+pytest>=8.0.0
+pytest-asyncio>=0.23.0
+pytest-mock>=3.12.0
+
+# Type hints
+typing-extensions>=4.9.0