Add detailed logging for video generation debugging

- Log video generation request details
- Log image upload status
- Log WaveSpeed API responses
- Update job status messages for better UI feedback

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/content_engine/api/routes_video.py

@@ -157,8 +157,11 @@ async def generate_video_cloud(
     import random
     import httpx
 
+    logger.info("Video cloud generation request: model=%s, backend=%s, frames=%d", model, backend, num_frames)
+
     # Route to Higgsfield for Kling 3.0 models
     if backend == "higgsfield" or model.startswith("kling-3"):
+        logger.info("Routing to Higgsfield for model: %s", model)
         return await generate_video_higgsfield(
             image=image,
             prompt=prompt,
@@ -168,6 +171,7 @@ async def generate_video_cloud(
         )
 
     if not _wavespeed_provider:
+        logger.error("WaveSpeed provider not configured!")
         raise HTTPException(500, "WaveSpeed API not configured")
 
     job_id = str(uuid.uuid4())[:8]
@@ -394,9 +398,14 @@ async def _generate_cloud_video(
     import httpx
     import aiohttp
 
+    logger.info("Starting cloud video generation: job=%s, model=%s, image_size=%d bytes", job_id, model, len(image_bytes))
+    _video_jobs[job_id]["message"] = "Uploading image..."
+
     try:
         # Upload image to temporary hosting (WaveSpeed needs URL)
+        logger.info("Uploading image to temp host...")
         image_url = await _wavespeed_provider._upload_temp_image(image_bytes)
+        logger.info("Image uploaded: %s", image_url[:80] if image_url else "FAILED")
 
         # Resolve model to WaveSpeed model ID
         from content_engine.services.cloud_providers.wavespeed_provider import VIDEO_MODEL_MAP
@@ -414,6 +423,9 @@ async def _generate_cloud_video(
         if negative_prompt:
             payload["negative_prompt"] = negative_prompt
 
+        _video_jobs[job_id]["message"] = f"Calling WaveSpeed API ({wavespeed_model})..."
+        logger.info("Calling WaveSpeed video API: %s", endpoint)
+
         async with httpx.AsyncClient(timeout=300) as client:
             resp = await client.post(
                 endpoint,
@@ -432,6 +444,7 @@ async def _generate_cloud_video(
                 return
 
             result = resp.json()
+            logger.info("WaveSpeed video API response: %s", str(result)[:500])
             data = result.get("data", result)
 
             # Check for failed status