feat: add AI provider config files to .gitignore

Add deepseek, claude, gemini, and grok settings files to .gitignore to prevent accidental commits of local AI provider configurations.

.gitignore

@@ -73,6 +73,10 @@ venv
 .claude/minmax-settings.json
 .claude/zhipu-settings.json
 .claude/settings.local.json
+.claude/deepseek-settings.json
+.claude/claude-settings.json
+.claude/gemini-settings.json
+.claude/grok-settings.json
 !.claude/development.md  # Exception: allow development docs
 !.claude/skills/         # Exception: allow project skills
 !.claude/memory/         # Exception: allow project memory
@@ -80,3 +84,4 @@ venv
 
 # Tiktoken cache files
 gns3server/agent/gns3_copilot/cache/tiktoken/
+