fix: add mempalace-mcp console entry point for pipx/uv compatibility

The MCP server config used `python -m mempalace.mcp_server` which fails
when mempalace is installed via pipx or uv, since the system python
cannot find the module in the isolated venv. Adding a `mempalace-mcp`
console_scripts entry point ensures the MCP server works regardless of
installation method (pip, pipx, uv, conda).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -38,6 +38,7 @@ Repository = "https://github.com/MemPalace/mempalace"
 
 [project.scripts]
 mempalace = "mempalace.cli:main"
+mempalace-mcp = "mempalace.mcp_server:main"
 
 [project.entry-points."mempalace.backends"]
 chroma = "mempalace.backends.chroma:ChromaBackend"