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.json

@@ -1,19 +1,19 @@
 {
   "mcpServers": {
     "gitea": {
-      "command": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/gitea/.venv/bin/python",
+      "command": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/gitea/.venv/bin/python",
       "args": ["-m", "mcp_server.server"],
-      "cwd": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/gitea",
+      "cwd": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/gitea",
       "env": {
-        "PYTHONPATH": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/gitea"
+        "PYTHONPATH": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/gitea"
       }
     },
     "wikijs": {
-      "command": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/wikijs/.venv/bin/python",
+      "command": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/wikijs/.venv/bin/python",
       "args": ["-m", "mcp_server.server"],
-      "cwd": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/wikijs",
+      "cwd": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/wikijs",
       "env": {
-        "PYTHONPATH": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/wikijs"
+        "PYTHONPATH": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/wikijs"
       }
     }
   }