Add admin panel, WebSocket support, and API versioning

Introduce an admin portal (React + Nginx), WebSocket routing, and
API versioning middleware with `/api/v1/` prefix deprecation.
Add master API key authentication, new Prometheus metrics for AI
token consumption and active WebSockets, and extend S3 config
with a public endpoint URL. Update test paths and fixtures to
align with the new routing structure.

app/services/ai_vision.py

@@ -338,6 +338,8 @@ async def summarize_url(url: str, content: str, language: str = "français") ->
         "summary": "",
         "tags": [],
         "model": settings.AI_PROVIDER,
+        "prompt_tokens": None,
+        "output_tokens": None,
     }
 
     if not settings.AI_ENABLED:
@@ -370,6 +372,7 @@ Retourne UNIQUEMENT ce JSON :
             if parsed:
                 result["summary"] = parsed.get("summary", "")
                 result["tags"] = parsed.get("tags", [])
+                result["prompt_tokens"], result["output_tokens"] = response.get("usage")
 
     except Exception as e:
         logger.error("ai.summarize_url.error", extra={"error": str(e)})
@@ -385,6 +388,9 @@ async def draft_task(description: str, context: Optional[str], language: str = "
         "steps": [],
         "estimated_time": None,
         "priority": None,
+        "model": settings.AI_PROVIDER,
+        "prompt_tokens": None,
+        "output_tokens": None,
     }
 
     if not settings.AI_ENABLED:
@@ -416,6 +422,7 @@ Retourne UNIQUEMENT ce JSON :
             parsed = _extract_json(text)
             if parsed:
                 result.update(parsed)
+                result["prompt_tokens"], result["output_tokens"] = response.get("usage")
 
     except Exception as e:
         logger.error("ai.draft_task.error", extra={"error": str(e)})