docs: add standardized comments to all services (Python, Go, Bash)

- Add docs/commenting-standard.md defining per-language comment standards
  (Go godoc, Python PEP-257, C Doxygen, Bash header blocks, SQL banners)

- services/dashboard: 100% docstring coverage (100/100 functions)
  - All FastAPI route handlers, helpers, classes, and models documented
  - Language: French (project convention)

- services/bot-detector: 100% docstring coverage (53/53 symbols)
  - bot_detector.py: 14 functions + module docstring
  - anubis/fetch_rules.py: 9 functions

- shared/python/ja4_common: full docstrings on ClickHouseClient (7 methods)
  and ClickHouseSettings class

- services/correlator: 24 godoc comments added across 6 Go files
  - correlation_service.go: 10 private helpers
  - unixsocket/source.go: 6 parsing/socket helpers
  - correlated_log.go: 4 field extraction helpers
  - orchestrator.go, logger.go, main.go: 4 comments

- services/correlator/scripts/audit-architecture.sh: standardized header block

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

services/dashboard/backend/routes/ml_features.py

@@ -11,6 +11,7 @@ router = APIRouter(prefix="/api/ml", tags=["ml_features"])
 
 def _attack_type(fuzzing_index: float, hit_velocity: float,
                  is_fake_nav: int, ua_ch_mismatch: int) -> str:
+    """Déduit le type d'attaque depuis les métriques comportementales."""
     if fuzzing_index > 50:
         return "brute_force"
     if hit_velocity > 1.0:
@@ -113,6 +114,7 @@ async def get_ip_radar(ip: str):
         row = result.result_rows[0]
 
         def _f(v) -> float:
+            """Convertit une valeur nullable en float (None ou falsy → 0.0)."""
             return float(v or 0)
 
         return {