fix: Address Gemini Code Assist review feedback

- Repository URL consistency: Updated all references to BeehiveInnovations/zen-mcp-server format
- Documentation clarity: Fixed misleading table headers and improved Docker configuration examples
- File conventions: Added missing final newlines to all files
- Configuration consistency: Clarified API key placeholder format in documentation

Addresses all points raised in PR #17 review by Gemini Code Assist.

🤖 Generated with Claude Code

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

.github/ISSUE_TEMPLATE/tool_addition.yml

@@ -71,4 +71,5 @@ body:
       label: Contribution
       options:
         - label: I am willing to submit a Pull Request to implement this new tool.
-        - label: I have checked that this tool doesn't overlap significantly with existing tools (analyze, codereview, debug, thinkdeep, chat).
+        - label: I have checked that this tool doesn't overlap significantly with existing tools (analyze, codereview, debug, thinkdeep, chat).
+