Phase 1 foundation: Prisma + /api/meetings CRUD (#1)

* feat(phase-1): Prisma 연동 + 회의록 CRUD API

Phase 1 foundation (ROADMAP #1~#3):

- src/lib/db.ts: Prisma 클라이언트 싱글톤 (dev hot-reload 대응)
- Meeting 스키마 확장: attendees/tags (String[]), template/depth/
  summaryMode/customPrompt (향후 참조 복원용), createdAt 인덱스
- 첫 마이그레이션 `20260421104750_init` 생성
- /api/meetings (GET 목록 + POST 생성)
  - q 파라미터로 제목/transcript/markdown 부분 검색
  - limit (max 100), offset 페이지네이션
  - attendees/tags 배열 타입 정규화
- /api/meetings/[id] (GET/PUT/DELETE)
  - PUT은 markdownMinutes/title/attendees/tags만 편집 허용
  - 존재하지 않는 id에 대해 404
- docker-compose.yml: tools 프로필에 migrate 서비스 추가
  (app 컨테이너 bloat 없이 마이그레이션 실행)
- Prisma mock 기반 API 테스트 14개 신규 (총 71 tests)

* docs: migrate 실행 단계 추가, ROADMAP의 #1/#2 완료 체크

* docs: PR 본문 드래프트 추가

src/app/api/meetings/route.ts

@@ -0,0 +1,119 @@
+import { NextRequest } from 'next/server'
+import { prisma } from '@/lib/db'
+
+const DEFAULT_LIMIT = 20
+const MAX_LIMIT = 100
+
+export async function GET(request: NextRequest) {
+  try {
+    const url = new URL(request.url)
+    const q = url.searchParams.get('q')?.trim() ?? ''
+    const limit = Math.min(
+      MAX_LIMIT,
+      Math.max(1, Number(url.searchParams.get('limit')) || DEFAULT_LIMIT),
+    )
+    const offset = Math.max(0, Number(url.searchParams.get('offset')) || 0)
+
+    const where = q
+      ? {
+          OR: [
+            { title: { contains: q, mode: 'insensitive' as const } },
+            { rawTranscript: { contains: q, mode: 'insensitive' as const } },
+            { markdownMinutes: { contains: q, mode: 'insensitive' as const } },
+          ],
+        }
+      : undefined
+
+    const [meetings, total] = await Promise.all([
+      prisma.meeting.findMany({
+        where,
+        orderBy: { createdAt: 'desc' },
+        take: limit,
+        skip: offset,
+        select: {
+          id: true,
+          title: true,
+          createdAt: true,
+          updatedAt: true,
+          tags: true,
+          attendees: true,
+          template: true,
+          summaryMode: true,
+          status: true,
+        },
+      }),
+      prisma.meeting.count({ where }),
+    ])
+
+    return Response.json({
+      meetings,
+      total,
+      limit,
+      offset,
+    })
+  } catch (err) {
+    const message = err instanceof Error ? err.message : '알 수 없는 오류'
+    return Response.json(
+      { error: `회의록 목록 조회 실패: ${message}` },
+      { status: 500 },
+    )
+  }
+}
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json()
+    const {
+      title,
+      rawTranscript,
+      markdownMinutes,
+      summaryMode,
+      template,
+      depth,
+      customPrompt,
+      attendees,
+      tags,
+    } = body
+
+    if (!title || typeof title !== 'string' || title.trim().length === 0) {
+      return Response.json(
+        { error: '제목은 필수입니다.' },
+        { status: 400 },
+      )
+    }
+
+    if (!markdownMinutes || typeof markdownMinutes !== 'string') {
+      return Response.json(
+        { error: '회의록 본문은 필수입니다.' },
+        { status: 400 },
+      )
+    }
+
+    const meeting = await prisma.meeting.create({
+      data: {
+        title: title.trim(),
+        rawTranscript: typeof rawTranscript === 'string' ? rawTranscript : null,
+        markdownMinutes,
+        summaryMode: typeof summaryMode === 'string' ? summaryMode : null,
+        template: typeof template === 'string' ? template : null,
+        depth: typeof depth === 'string' ? depth : null,
+        customPrompt: typeof customPrompt === 'string' ? customPrompt : null,
+        attendees: Array.isArray(attendees)
+          ? attendees.filter((a) => typeof a === 'string')
+          : [],
+        tags: Array.isArray(tags)
+          ? tags.filter((t) => typeof t === 'string')
+          : [],
+        status: 'COMPLETED',
+      },
+    })
+
+    return Response.json(meeting, { status: 201 })
+  } catch (err) {
+    const message = err instanceof Error ? err.message : '알 수 없는 오류'
+    return Response.json(
+      { error: `회의록 생성 실패: ${message}` },
+      { status: 500 },
+    )
+  }
+}