fix: resolve pyodide version conflict for Docker builds

- Added override for pyodide@0.26.4 to resolve version conflict
- @langchain/community requires pyodide <0.27.0 but npm was installing 0.28.0
- This was causing Railway Docker build failures with npm ci

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

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

package.json

@@ -143,5 +143,8 @@
     "@rollup/rollup-darwin-arm64": "^4.50.0",
     "@rollup/rollup-linux-x64-gnu": "^4.50.0",
     "better-sqlite3": "^11.10.0"
+  },
+  "overrides": {
+    "pyodide": "0.26.4"
   }
 }