feat: auto-detect events, seva tasks, and FAQs from WhatsApp messages

Adds the AI-driven content pipeline so portal content is never manually
created — the system proposes it, admins review and approve.

Worker:
- `tower.event.extract` queue + Event Extractor processor: LLM extracts
  event title/date/time/location from messages with #event hashtag,
  date/time patterns, RSVP phrases, or location terms; seva action items
  within event messages become separate SEVA_TASK drafts
- `tower.faq.candidate` queue + FAQ Curator processor: LLM extracts Q&A
  pairs from messages with question patterns + meaningful answer length
- `classify.processor.ts`: `isEventCandidate()` and `isFaqCandidate()`
  run after rule matching on all non-spam, non-DNC messages; candidates
  are enqueued to the extraction lanes in parallel with normal routing
- `match-rules.ts`: add P1 to TenantRuleRow action union so P1 rules
  are fully typed end-to-end
- `NormalizedMessage`: add `quotedPlatformMsgId` field
- `IngestJobData.effectiveAction`: add `'P1'` to the union

Schema:
- `ContentDraft` model with `DraftType` (EVENT|SEVA_TASK|FAQ_ITEM) and
  `DraftStatus` (PENDING_REVIEW|APPROVED|REJECTED); carries `proposedJson`
  from the LLM, `confidence` score, and `publishedId` after approval
- Migration: `20260617270000_add_content_drafts`

API:
- `DraftsModule`: `GET /admin/drafts`, `POST /admin/drafts/:id/approve`,
  `POST /admin/drafts/:id/reject`; approve creates the actual
  Event/SevaOpportunity/KnowledgeItem and marks the draft APPROVED;
  reject marks it REJECTED — both audit-logged

Web:
- `/admin/drafts` and `/drafts` — tabbed view by type (All/Events/Seva/FAQ)
- `DraftCard` — shows source message excerpt, AI proposed content, and
  approve/reject buttons; approve/reject immediately refresh the list
- "AI Drafts" added to both super-admin and tenant-admin sidebars
- "AI Content Drafts" button added to admin dashboard

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

apps/api/prisma/schema.prisma

@@ -100,6 +100,7 @@ model Tenant {
   knowledgeItems     KnowledgeItem[]
   galleryAlbums      GalleryAlbum[]
   galleryItems       GalleryItem[]
+  contentDrafts      ContentDraft[]
 }
 
 enum AdminRole {
@@ -279,7 +280,8 @@ model Message {
   createdAt           DateTime      @default(now())
   updatedAt           DateTime      @updatedAt
 
-  approval Approval?
+  approval       Approval?
+  contentDrafts  ContentDraft[]
 
   @@unique([platform, platformMsgId])
   @@index([tenantId])
@@ -837,3 +839,40 @@ model GalleryItem {
   @@index([albumId])
   @@index([tenantId])
 }
+
+// ============================================================================
+// Content Drafts — AI-proposed Event/Seva/FAQ pending admin review
+// ============================================================================
+
+enum DraftType {
+  EVENT
+  SEVA_TASK
+  FAQ_ITEM
+}
+
+enum DraftStatus {
+  PENDING_REVIEW
+  APPROVED
+  REJECTED
+}
+
+model ContentDraft {
+  id              String      @id @default(cuid())
+  tenantId        String
+  tenant          Tenant      @relation(fields: [tenantId], references: [id])
+  type            DraftType
+  status          DraftStatus @default(PENDING_REVIEW)
+  sourceMessageId String
+  sourceMessage   Message     @relation(fields: [sourceMessageId], references: [id])
+  proposedJson    Json
+  confidence      Float?
+  reviewedBy      String?
+  reviewedAt      DateTime?
+  publishedId     String?
+  createdAt       DateTime    @default(now())
+  updatedAt       DateTime    @updatedAt
+
+  @@index([tenantId, status])
+  @@index([tenantId, type, status])
+  @@index([sourceMessageId])
+}