Phase 6: sync jobs, inquiry and order forms

- Sync scheduler in the content service with a per-job cache (sync_cache),
  sync_runs reporting and Healthchecks pings. Jobs: Archidekt, BoardGameGeek,
  cover art (Open Library, TMDB, AniList), Suwayomi and Kavita reading
  progress, Bambuddy filament and Homebox material stock. A note's own value
  always wins over a synced one.
- PersonalReader: updates only Library notes with a matching anilistId,
  changes to Greg's notes are held for review; Reading series with no note
  show as suggestions on the admin Overview.
- /api/inquiries and /api/orders: Turnstile, rate limits, a saved copy in the
  content service (intake token) plus email over SMTP. Orders are re-checked
  against the live notes: accepted only when the category's ordersOpen is
  true and the line has capacity.
- Admin Inbox for saved submissions. Options' inStock is optional so synced
  stock can fill it. All settings from process.env; .env.example per service.
- Sources could not be reached from the build environment; parsers are tested
  against fixtures labelled as not live.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012aSbo2D1qP8cMFQCykf7kx

services/content/test/sync/fixtures/bambuddy-spools.sample.json

@@ -0,0 +1,11 @@
+{
+  "_comment": "GUESSED SHAPE. Bambuddy's API is undocumented here; this only exercises mapBambuddySpools' tolerant reading.",
+  "items": [
+    { "id": 1, "material": "PLA", "color_name": "Jade White", "color_hex": "F5F5DCFF", "remaining_weight": 640 },
+    { "id": 2, "material": "PLA", "color_name": "Jade White", "color_hex": "F5F5DC", "remaining_weight": 20 },
+    { "id": 3, "material": "PLA", "colorName": "Bambu Green", "colorHex": "#00AE42", "remainingWeight": 15 },
+    { "id": 4, "material": "PETG", "color": "Translucent Orange", "hex": "#FF6A13", "remaining": 900 },
+    { "id": 5, "material": "PLA", "color_name": "Old Spool", "archived": true, "remaining_weight": 500 },
+    { "id": 6, "material": "PLA", "color_name": "Charcoal", "color_hex": "#2b2b2b" }
+  ]
+}