feat(defects): read API — feed, per-section counts and history (T6)

GET /api/defects returns a newest-first feed joined to the project name,
bounded by limit; ?section=ID narrows to one section's history. GET
/api/defects/counts returns { sectionId: n } for the weak-point map. Adds a
(section_id, created_at) index and a db:seed script; ~2k rows query in ~20ms.

server/db/seed.ts

@@ -0,0 +1,23 @@
+// Seed defects for perf-checking the dashboard (F6 target: ≤1s at ~2k rows).
+//   SEED_COUNT=2000 pnpm db:seed
+import { getDb, getPool } from './client'
+import { createProject } from './repositories/projects'
+import { defects } from './schema'
+import { sections } from '../../app/board/definition'
+
+const count = Number(process.env.SEED_COUNT ?? 2000)
+const db = getDb()
+
+const project = await createProject(db, 'Seed Project')
+const rows = Array.from({ length: count }, (_, i) => ({
+  sectionId: sections[i % sections.length]!.id,
+  projectId: project.id,
+  verbatim: `seeded defect #${i}`,
+  reporterEmail: 'seed@theodo.com',
+  // Spread timestamps so the feed ordering is meaningful.
+  createdAt: new Date(Date.now() - i * 60_000),
+}))
+
+await db.insert(defects).values(rows)
+console.log(`[seed] inserted ${count} defects`)
+await getPool().end()