chore: update CLAUDE.md

CLAUDE.md

@@ -135,3 +135,12 @@ When adding new services:
 3. Store credentials in Vault using established patterns
 4. Create Keycloak client if authentication required
 5. Import module in main justfile
+
+## Code Style
+
+- Indent lines with 4 spaces
+- Do not use trailing whitespace
+- It must pass the command: `just --fmt --check --unstable`
+- Follow existing Justfile patterns
+- Only write code comments when necessary, as the code should be self-explanatory
+- Write output messages and code comments in English