feat(tempo): harden worklog sync and add tests [FASE-1.4]

Add tempo-api-python-client dependency, TEMPO_API_VERSION setting, enum-safe Jira link lookup, work type on create_worklog, and mocked auto_log tests.

backend/app/config.py

@@ -57,6 +57,7 @@ class Settings(BaseSettings):
     # ── Tempo Integration ─────────────────────────────────────────────
     TEMPO_ENABLED: bool = False
     TEMPO_API_TOKEN: str = ""
+    TEMPO_API_VERSION: int = 4
     TEMPO_DEFAULT_WORK_TYPE: str = "Red Team"
 
     # ── OSINT / Intelligence ────────────────────────────────────────