feat(subscriptions): overview groups, coverage matrix, multi-version auto-fill, form field normalization (W9-E)

- 0035: subscription.last_progress_at, acquisition_slot.position (primary version)
- GET /subscriptions: server-side groups + counts, card fields, sort/filter, offset cursor
- GET /subscriptions/{id}/coverage: season x episode (movie: edition) x slot matrix, 30s cache
- auto-fill for non-primary slots: inherit/on/off, per-subscription daily budget, upgrade priority
- params normalization with MP/legacy aliases; duplicate 409; pause/resume/resubscribe/batch/fill/slot-order

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/db/src/types.ts

@@ -293,6 +293,7 @@ export interface AcquisitionSlotTable {
   updated_at: GeneratedTimestamptz;
   reserved_plan_id: string | null;
   rule_group_ids: Generated<Json>;
+  position: Generated<number>;
 }
 
 export interface AdminSessionTable {
@@ -1442,6 +1443,7 @@ export interface SubscriptionTable {
   updated_at: GeneratedTimestamptz;
   last_searched_at: Timestamptz | null;
   next_search_at: Timestamptz | null;
+  last_progress_at: Timestamptz | null;
 }
 
 export interface SubscriptionHistoryTable {