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/archidekt-deck.sample.json

@@ -0,0 +1,39 @@
+{
+  "_sample": "Hand-written from Archidekt's deck response shape; not a live response.",
+  "id": 1234567,
+  "name": "Sample Atraxa Superfriends",
+  "deckFormat": 3,
+  "featured": "https://storage.googleapis.com/topdekt-user/images/sample-featured.jpg",
+  "customFeatured": "",
+  "private": false,
+  "categories": [
+    { "id": 1, "name": "Commander", "isPremier": true, "includedInDeck": true, "includedInPrice": true },
+    { "id": 2, "name": "Ramp", "isPremier": false, "includedInDeck": true, "includedInPrice": true },
+    { "id": 3, "name": "Maybeboard", "isPremier": false, "includedInDeck": false, "includedInPrice": false }
+  ],
+  "cards": [
+    {
+      "quantity": 1,
+      "categories": ["Commander"],
+      "card": {
+        "uid": "d0d33d52-3d28-4635-b985-51e126289259",
+        "oracleCard": { "name": "Atraxa, Praetors' Voice", "colorIdentity": ["White", "Blue", "Black", "Green"] }
+      }
+    },
+    {
+      "quantity": 1,
+      "categories": ["Ramp"],
+      "card": { "uid": "aaaa1111-0000-0000-0000-000000000000", "oracleCard": { "name": "Sol Ring", "colorIdentity": [] } }
+    },
+    {
+      "quantity": 34,
+      "categories": ["Land"],
+      "card": { "uid": "bbbb2222-0000-0000-0000-000000000000", "oracleCard": { "name": "Forest", "colorIdentity": ["Green"] } }
+    },
+    {
+      "quantity": 1,
+      "categories": ["Maybeboard"],
+      "card": { "uid": "cccc3333-0000-0000-0000-000000000000", "oracleCard": { "name": "Lightning Bolt", "colorIdentity": ["Red"] } }
+    }
+  ]
+}