Add job run logs, OpenRouter model picker, and discipline grouping.

- Job logs: each job's stdout/stderr is teed into outputs/<id>/job.log
  (survives restarts) and served at GET /jobs/{id}/log as text/plain, so
  full run logs can be shared for debugging and refinement.
- Model picker: GET /models proxies OpenRouter's public model list with
  per-1M-token pricing (1h cache, 502 on failure); the UI shows a model
  dropdown with costs when OpenRouter compute is selected, and the pick
  overrides vision+text models for that job (Classic and Agent modes).
- Conflicts in the report view are grouped by discipline pair
  (collapsible sections, severity-ordered within groups) instead of one
  flat severity-only list.

backend/main.py

@@ -41,6 +41,27 @@ def health():
             "email_configured": bool(config.SMTP_HOST and config.SMTP_USER and config.SMTP_PASSWORD)}
 
 
+@app.get("/models")
+def list_models():
+    """Available OpenRouter models with per-1M-token pricing for the UI picker."""
+    from backend.models import fetch_models
+    models = fetch_models()
+    if models is None:
+        raise HTTPException(status_code=502,
+                            detail="Could not fetch the model list from OpenRouter")
+    return {"models": models, "default": config.MODEL, "default_text": config.TEXT_MODEL}
+
+
+@app.get("/jobs/{job_id}/log")
+def job_log(job_id: str):
+    """The full captured stdout/stderr log of a job run (persists on disk)."""
+    path = os.path.join(config.OUTPUT_DIR, job_id, "job.log")
+    if not os.path.isfile(path):
+        raise HTTPException(status_code=404, detail="Log not found for this job")
+    with open(path, encoding="utf-8", errors="replace") as f:
+        return Response(content=f.read(), media_type="text/plain")
+
+
 @app.post("/check")
 async def check(
     file: UploadFile = File(...),
@@ -51,6 +72,7 @@ async def check(
     work_type: Optional[str] = Form(None),
     text_local: bool = Form(False),
     pipeline_mode: str = Form("classic"),
+    model: Optional[str] = Form(None),
 ):
     """
     Accept a PDF, start a background conflict check, and return a job_id
@@ -86,7 +108,7 @@ async def check(
     }
     job_id = create_job(tmp_path, source_filename=file.filename, email=email,
                         project_input=project_input, text_local=text_local,
-                        pipeline_mode=pipeline_mode)
+                        pipeline_mode=pipeline_mode, model=model)
     return JSONResponse({
         "job_id": job_id,
         "status": "queued",