Remove .claude personal config from repository and add to gitignore

Security fix: .claude/mcp-servers.json contained plain-text passwords:
- MySQL dev password: shopdb-dev-password
- VM SSH password: vos313 (SupportUser and shopfloor accounts)

These credentials are now in GitHub history and should be rotated.

Changes:
- Add .claude/settings*.json and mcp-servers.json to .gitignore
- Remove these files from git tracking (files remain locally)
- Keep shared team resources: skills/, plans/, setup/, maintenance/

These are personal/machine-specific configuration:
- settings.json: Personal hooks (stop-dev.cmd), preferences
- mcp-servers.json: Local paths, database credentials, SSH passwords

Each developer should configure their own .claude/ settings locally.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitignore

@@ -165,3 +165,8 @@ stop-dev.cmd
 # Not product source; developer-local utilities.
 scripts/.temp/
 scripts/docs/
+
+# Claude Code personal configuration (machine-specific)
+.claude/settings.json
+.claude/settings.local.json
+.claude/mcp-servers.json