Show spool availability indicator per job on jobs list

- filamentdb.spool_counts(): builds (material, color_name) → roll count
  from cached stock report; counts rolls_in_stock + rolls_in_use (non-graveyard)
- Jobs list: coloured dot before material — green (2+), yellow (1), red (0)
- FILAMENTDB_URL added to .env

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

app/routers/ui.py

@@ -20,7 +20,7 @@ from app.models.printer_type import PrinterType
 from app.models.pricing import PricingConfig
 from app.models.todo import Todo
 from app.constants import COLORS, MATERIALS
-from app.filamentdb import available_colors, available_materials, get_stock
+from app.filamentdb import available_colors, available_materials, get_stock, spool_counts
 from app.stl import get_stl_dir, list_stl_files
 from app.stl_analysis import analyse, get_cache_map  # noqa: F401 used in job_detail route
 
@@ -145,6 +145,7 @@ def jobs_page(request: Request, q: str = "", db: Session = Depends(get_db)):
         "stl_cache": get_cache_map(stl_files, db),
         "materials": available_materials() or MATERIALS,
         "colors": available_colors() or COLORS,
+        "spool_map": spool_counts(),
     })