feat(content): Phase 8 content generation (Faz A+B) for Sase.tr

Hybrid content automation pilot: generation + review + drafts live in the
panel (reusing the insight pipeline's DeepSeek client, prompt_templates
versioning, cost_ledger and budget_settings); publishing/distribution will
go through n8n (Faz C, not built). Channels: blog, LinkedIn, X, Instagram.
Topic sourcing is automatic (LLM-generated ideas). Approval model: drafts
sit in the panel for manual review/edit/publish.

Faz A (worker):
- ContentTopic / ContentDraft Prisma models (content_topics, content_drafts)
- content-prompts.ts: 5 seed prompts (topic ideas[pro] + blog[pro] +
  linkedin/x/instagram[flash]), Turkish B2B automotive tone, per-channel
  JSON schemas
- content-budget.ts: separate budget envelope (sums only content_* spend)
- content-topics job (auto idea gen, backlog-capped, title dedupe) +
  content-generate job (queued topic -> one draft per channel)
- content-pipeline scheduler (separate BullMQ queue, topics@*/8h,
  generate@*/10min), wired into index.ts; seeded via seed-runtime
- content budget settings (caps + content_paused kill switch); seed default
  content_paused=true for a safe first deploy

Faz B (web):
- /content (queue + auto/manual triggers + manual topic form),
  /content/t/[id] (per-channel draft cards: preview, JSON edits,
  approve/reject), /content/costs (content-only spend)
- server actions (audit-logged), manual trigger API routes, contentQueue(),
  nav + Cmd+K entries
- content caps surfaced on /insights/settings/budgets + whitelisted

Both packages typecheck. Schema applies on deploy (web start runs
prisma db push).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/prisma/schema.prisma

@@ -364,6 +364,71 @@ model EvalRun {
   @@map("eval_runs")
 }
 
+// ---------- Phase 8a: Content generation ----------
+
+// A topic/brief for content generation. Either auto-generated by the
+// content-topics job (LLM idea generation) or entered manually. One topic
+// fans out into one ContentDraft per selected channel.
+model ContentTopic {
+  id                  String   @id @default(cuid())
+  projectKey          String
+  title               String
+  brief               String   @db.Text
+  angle               String?  @db.Text
+  channels            String[] // ["blog","linkedin","x","instagram"]
+  keywords            String[]
+  /// queued | generating | drafted | archived
+  status              String   @default("queued")
+  /// auto | manual
+  source              String   @default("auto")
+  fingerprint         String?  // dedupe near-identical auto topics
+  sourcePromptTag     String?
+  sourcePromptVersion Int?
+  sourceModel         String?
+  sourceCostUsd       Float    @default(0)
+  createdAt           DateTime @default(now())
+  updatedAt           DateTime @updatedAt
+
+  drafts ContentDraft[]
+
+  @@index([projectKey, status])
+  @@index([fingerprint])
+  @@map("content_topics")
+}
+
+// One generated piece of content for a single channel. Lives as a draft in
+// the panel; founder reviews/edits, then publishes via the n8n webhook
+// (Phase 8c). bodyJson holds the channel-specific generated structure;
+// founderEdits holds any human overrides applied before publish.
+model ContentDraft {
+  id                  String   @id @default(cuid())
+  topicId             String
+  projectKey          String
+  /// blog | linkedin | x | instagram
+  channel             String
+  /// draft | approved | publishing | published | failed | rejected
+  status              String   @default("draft")
+  bodyJson            Json
+  founderEdits        Json?
+  publishedUrl        String?
+  n8nExecutionId      String?
+  publishError        String?
+  sourcePromptTag     String
+  sourcePromptVersion Int
+  sourceModel         String
+  sourceCostUsd       Float    @default(0)
+  publishedAt         DateTime?
+  createdAt           DateTime @default(now())
+  updatedAt           DateTime @updatedAt
+
+  topic ContentTopic @relation(fields: [topicId], references: [id], onDelete: Cascade)
+
+  @@index([projectKey, status])
+  @@index([topicId])
+  @@index([channel, status])
+  @@map("content_drafts")
+}
+
 // ---------- Phase 7a: Sase user-management ----------
 
 // Founder-only notes pinned to a Sase user. Stored panel-side (KVKK minimize: