Move API credentials to secrets.md (gitignored)

- Created secrets.md for Zabbix/Gitea tokens and DB creds
- Updated CLAUDE.md to reference secrets.md
- Added secrets.md to .gitignore

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -170,16 +170,15 @@ PCs are in the machines table, identified by:
 
 ### Zabbix API
 
-- **URL:** `http://10.48.130.113:8080/api_jsonrpc.php`
-- **Token:** `9e60b0544ec77131d94825eaa2f3f1645335539361fd33644aeb8326697aa48d`
 - **Config File:** `includes/zabbix.asp`
 - **Used For:** Printer supply levels, host monitoring
+- **Credentials:** See `secrets.md`
 
 ### Gitea (Version Control)
 
 - **URL:** `http://localhost:3000`
-- **API Token:** `920b6601a4481be582a513cd6ba489a30e0dba20`
 - **Repo:** `cproudlock/shopdb`
+- **Credentials:** See `secrets.md`
 
 ## Testing