Remove internal filament management, integrate FilamentDB, add job detail page

Filament removal:
- Deleted app/models/filament.py, routers/filaments.py, templates/filaments.html
- Migration 0009: drops filaments table and filament_id FK from print_jobs
- Removed Filaments from sidebar and all internal references

FilamentDB integration (read-only):
- app/filamentdb.py: GET /reports/stock with 5-min in-memory cache
- available_materials() / available_colors() populate job form dropdowns
- Falls back to static constants if FilamentDB unreachable
- Dashboard filament count now from FilamentDB rolls_in_stock
- FILAMENTDB_URL added to .env.install; httpx added to requirements

Job detail page (/jobs/{id}):
- Two cards: Job info (customer, material, printer, bracket, timing, cost)
  and File & Geometry (bounding box + volume from stl_cache)
- Log timeline with Add Entry modal
- Filename in jobs list links to detail page

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

app/filamentdb.py

@@ -0,0 +1,66 @@
+import logging
+import os
+import time
+
+import httpx
+
+logger = logging.getLogger("pops")
+
+_cache: dict[str, tuple[float, list]] = {}
+_TTL = 300  # seconds
+
+
+def _base() -> str:
+    return os.environ.get("FILAMENTDB_URL", "https://web.filamentdb.orb.local").rstrip("/")
+
+
+def _get(path: str, params: dict | None = None) -> list | dict:
+    r = httpx.get(f"{_base()}{path}", params=params, timeout=5, verify=False)
+    r.raise_for_status()
+    return r.json()
+
+
+def _cached(key: str, fetch):
+    now = time.monotonic()
+    if key in _cache and now - _cache[key][0] < _TTL:
+        return _cache[key][1]
+    try:
+        result = fetch()
+        _cache[key] = (now, result)
+        return result
+    except Exception:
+        logger.warning("FilamentDB unreachable — using cached/fallback data")
+        return _cache.get(key, (0, []))[1]
+
+
+def get_stock() -> list[dict]:
+    """All filament types with stock counts from /reports/stock."""
+    return _cached("stock", lambda: _get("/reports/stock"))
+
+
+def available_materials() -> list[str]:
+    """Unique materials that have at least one roll in stock."""
+    rows = get_stock()
+    seen, out = set(), []
+    for r in rows:
+        m = r.get("material", "")
+        if m and r.get("rolls_in_stock", 0) > 0 and m not in seen:
+            seen.add(m)
+            out.append(m)
+    return sorted(out)
+
+
+def available_colors(material: str | None = None) -> list[str]:
+    """Unique color names in stock, optionally filtered by material."""
+    rows = get_stock()
+    seen, out = set(), []
+    for r in rows:
+        if r.get("rolls_in_stock", 0) <= 0:
+            continue
+        if material and r.get("material") != material:
+            continue
+        c = r.get("color_name") or ""
+        if c and c not in seen:
+            seen.add(c)
+            out.append(c)
+    return sorted(out)