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/analysis.py

@@ -374,6 +374,7 @@ async def analyze_user_agents(ip: str):
         
         # Classification des UAs
         def classify_ua(ua: str) -> str:
+            """Classe un User-Agent en 'bot', 'script', 'browser' ou 'unknown'."""
             ua_lower = ua.lower()
             if any(bot in ua_lower for bot in ['bot', 'crawler', 'spider', 'curl', 'wget', 'python', 'requests', 'scrapy']):
                 return 'bot'