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/config.py

@@ -5,6 +5,7 @@ from pydantic_settings import BaseSettings
 
 
 class Settings(BaseSettings):
+    """Paramètres de configuration de l'application chargés depuis l'environnement."""
     # ClickHouse
     CLICKHOUSE_HOST: str = "clickhouse"
     CLICKHOUSE_PORT: int = 8123
@@ -22,6 +23,7 @@ class Settings(BaseSettings):
     CORS_ORIGINS: list = ["http://localhost:3000", "http://127.0.0.1:3000"]
 
     class Config:
+        """Configuration Pydantic pour le chargement du fichier .env."""
         env_file = ".env"
         case_sensitive = True