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/routers/images.py

@@ -25,6 +25,9 @@ from app.schemas import (
 from app.services import storage
 from app.middleware import limiter, get_upload_rate_limit
 from app.workers.image_worker import QUEUE_STANDARD, QUEUE_PREMIUM
+from app.metrics import (
+    hub_images_uploaded, hub_images_deleted, hub_storage_used_bytes, hub_arq_jobs_enqueued
+)
 
 logger = logging.getLogger(__name__)
 
@@ -102,13 +105,14 @@ async def upload_image(
     await db.commit()
     await db.refresh(image)
 
-    # Enqueue dans ARQ (persistant, avec retry)
+    # Enqueue dans ARQ
     arq_pool = request.app.state.arq_pool
-    await arq_pool.enqueue_job(
-        "process_image_task",
-        image.id,
-        str(client.id)
-    )
+    await arq_pool.enqueue_job("process_image_task", image.id, str(client.id))
+
+    # Metrics
+    hub_images_uploaded.labels(client_id=client.id).inc()
+    hub_storage_used_bytes.labels(client_id=client.id).set(client.storage_used_bytes)
+    hub_arq_jobs_enqueued.labels(queue="default").inc()
 
     return UploadResponse(
         id=image.id,
@@ -190,6 +194,8 @@ async def list_images(
                 height=img.height,
                 uploaded_at=img.uploaded_at,
                 processing_status=img.processing_status,
+                client_id=img.client_id,
+                client_name=client.name,
                 ai_tags=img.ai_tags,
                 ai_description=img.ai_description,
                 thumbnail_path=img.thumbnail_path,
@@ -444,6 +450,10 @@ async def delete_image(
     await db.delete(image)
     await db.commit()
 
+    # Metrics
+    hub_images_deleted.labels(client_id=client.id).inc()
+    hub_storage_used_bytes.labels(client_id=client.id).set(client.storage_used_bytes)
+
     return DeleteResponse(deleted_id=image_id)