fix(admin): correct docker volume mount + pipeline_routes repo root

- docker-compose.prod.yml: fix volume mount for all 6 web containers
  from /opt/padelnomics/data (stale) → /data/padelnomics (live supervisor output);
  add LANDING_DIR=/app/data/pipeline/landing so extraction/landing stats work
- pipeline_routes.py: fix _REPO_ROOT parents[5] → parents[4] so workflows.toml
  is found in dev and pipeline overview shows workflow schedules

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/padelnomics/admin/pipeline_routes.py

@@ -49,7 +49,7 @@ _LANDING_DIR = os.environ.get("LANDING_DIR", "data/landing")
 _SERVING_DUCKDB_PATH = os.environ.get("SERVING_DUCKDB_PATH", "data/analytics.duckdb")
 
 # Repo root: web/src/padelnomics/admin/ → up 4 levels
-_REPO_ROOT = Path(__file__).resolve().parents[5]
+_REPO_ROOT = Path(__file__).resolve().parents[4]
 _WORKFLOWS_TOML = _REPO_ROOT / "infra" / "supervisor" / "workflows.toml"
 
 # A "running" row older than this is considered stale/crashed.