fix(docs): fix pip install command formatting

- Removed extra spaces within the optional dependencies list
- Added quotes around the dependency list to ensure proper bash parsing
- Corrected capitalization for consistency in package names

Author: Phil-Fan

README.md

@@ -84,7 +84,7 @@ pip install trpc-agent-py
 Install optional capabilities as needed:
 
 ```bash
-pip install trpc-agent-py[a2a,ag-ui,knowledge,agent-claude,mem0, Mempalace, langfuse]
+pip install "trpc-agent-py[a2a,ag-ui,knowledge,agent-claude,mem0,mempalace,langfuse]"
 ```
 
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