refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조

에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게 [공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류. 문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인). - Topic_Programming → Domain_Programming (내부 구조 보존) - Topic_Graphic → Domain_Design - Topic_Business → Domain_Product - Topic_General → Domain_General - _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning), Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing) - 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서) - 빈 폴더 정리 (memory/procedures) - 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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+---
+id: wiki-2026-0508-사용자-제작-콘텐츠-ugc
+title: 사용자 제작 콘텐츠 (UGC)
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [User-Generated Content, UGC, User Content]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.9
+verification_status: applied
+tags: [ugc, content, moderation, platform, architecture]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: typescript
+  framework: nextjs
+---
+
+# 사용자 제작 콘텐츠 (UGC)
+
+## 매 한 줄
+> **"매 user 의 platform 에서 create 하는 content"**. 매 Web 2.0 (2004) 의 core concept — Wikipedia, YouTube, Reddit 의 fuel. 2026 년 매 LLM-generated content + human content 의 mix 의 challenge — 매 provenance, moderation, copyright 의 critical.
+
+## 매 핵심
+
+### 매 lifecycle
+1. **Creation**: 매 upload, post, comment.
+2. **Storage**: 매 object storage (S3, R2) + DB metadata.
+3. **Moderation**: 매 automated (Perspective API, OpenAI Moderation) + human review.
+4. **Distribution**: 매 CDN + recommendation algorithm.
+5. **Lifecycle end**: 매 delete, archive, takedown (DMCA).
+
+### 매 challenges (2026)
+- **AI-generated content**: 매 deepfake, slop — provenance (C2PA) 의 필요.
+- **Moderation scale**: 매 LLM moderator 의 cost-effective.
+- **Copyright**: 매 training data 의 lawsuit (NYT v OpenAI 등).
+- **Liability**: 매 Section 230 (US), DSA (EU) 의 compliance.
+
+### 매 응용
+1. Social media — 매 post, video, comment.
+2. Reviews/ratings — 매 e-commerce.
+3. Forums — 매 Reddit, Discord, HN.
+4. Wiki — 매 collaborative knowledge.
+
+## 💻 패턴
+
+### Upload + S3 presigned URL
+```typescript
+// API: generate presigned URL
+import { S3Client, PutObjectCommand } from '@aws-sdk/client-s3';
+import { getSignedUrl } from '@aws-sdk/s3-request-presigner';
+
+export async function POST(req: Request) {
+  const { userId } = await authenticate(req);
+  const { filename, contentType } = await req.json();
+
+  if (!ALLOWED_TYPES.includes(contentType)) {
+    return Response.json({ error: 'invalid type' }, { status: 400 });
+  }
+
+  const key = `uploads/${userId}/${crypto.randomUUID()}-${filename}`;
+  const url = await getSignedUrl(
+    s3,
+    new PutObjectCommand({ Bucket: 'ugc', Key: key, ContentType: contentType }),
+    { expiresIn: 300 }
+  );
+
+  return Response.json({ url, key });
+}
+```
+
+### Moderation pipeline (text)
+```typescript
+import OpenAI from 'openai';
+const openai = new OpenAI();
+
+async function moderateText(text: string) {
+  const result = await openai.moderations.create({
+    model: 'omni-moderation-latest',
+    input: text,
+  });
+  const r = result.results[0];
+  if (r.flagged) {
+    return { allowed: false, categories: r.categories };
+  }
+  return { allowed: true };
+}
+```
+
+### Image moderation (vision)
+```typescript
+// 매 NSFW + violence detection — Claude Opus 4.7 vision.
+import Anthropic from '@anthropic-ai/sdk';
+const client = new Anthropic();
+
+async function moderateImage(imageUrl: string) {
+  const res = await client.messages.create({
+    model: 'claude-opus-4-7',
+    max_tokens: 200,
+    messages: [{
+      role: 'user',
+      content: [
+        { type: 'image', source: { type: 'url', url: imageUrl } },
+        { type: 'text', text: 'Classify this image: SFW, NSFW, violence, hate, none. JSON only.' },
+      ],
+    }],
+  });
+  return JSON.parse(res.content[0].text);
+}
+```
+
+### Provenance (C2PA)
+```typescript
+// 매 image 의 origin metadata — AI 생성 여부 의 verify.
+import { read } from 'c2pa';
+
+async function checkProvenance(imageUrl: string) {
+  const c2pa = await read(imageUrl);
+  if (!c2pa) return { verified: false };
+
+  const manifest = c2pa.manifestStore?.activeManifest;
+  return {
+    verified: c2pa.manifestStore?.validationStatus === 'valid',
+    generator: manifest?.claimGenerator,
+    aiGenerated: manifest?.assertions.some((a) => a.label.startsWith('c2pa.actions.ai_')),
+  };
+}
+```
+
+### Vote + ranking
+```typescript
+// 매 Reddit-style — Wilson score interval.
+function wilsonScore(up: number, down: number) {
+  const n = up + down;
+  if (n === 0) return 0;
+  const z = 1.96; // 95% confidence
+  const p = up / n;
+  return (p + z*z/(2*n) - z * Math.sqrt((p*(1-p) + z*z/(4*n))/n)) / (1 + z*z/n);
+}
+
+const posts = await db.post.findMany();
+posts.sort((a, b) => wilsonScore(b.up, b.down) - wilsonScore(a.up, a.down));
+```
+
+### Rate limit (anti-spam)
+```typescript
+import { Ratelimit } from '@upstash/ratelimit';
+import { Redis } from '@upstash/redis';
+
+const ratelimit = new Ratelimit({
+  redis: Redis.fromEnv(),
+  limiter: Ratelimit.slidingWindow(10, '1 h'), // 10 posts/hour
+});
+
+const { success } = await ratelimit.limit(`post:${userId}`);
+if (!success) throw new Error('rate limit');
+```
+
+### DMCA takedown flow
+```typescript
+async function handleDmcaTakedown(claim: DmcaClaim) {
+  // 1. Hide content immediately
+  await db.content.update({
+    where: { id: claim.contentId },
+    data: { status: 'TAKEDOWN_PENDING' },
+  });
+
+  // 2. Notify uploader (counter-notice option)
+  await notifyUploader(claim);
+
+  // 3. Log for audit
+  await db.dmcaLog.create({ data: { ...claim, processedAt: new Date() } });
+}
+```
+
+## 매 결정 기준
+| Content type | Moderation |
+|---|---|
+| Text comment | OpenAI Moderation API + human review |
+| Image | Claude vision + perceptual hash (NCMEC PhotoDNA) |
+| Video | Frame sampling + ML + community flag |
+| Long-form (article) | Pre-publish review + post-flag |
+| Realtime chat | Profanity filter + ML in pipeline |
+
+**기본값**: 매 LLM moderation + human escalation queue.
+
+## 🔗 Graph
+- Adjacent: [[Content Moderation]] · [[C2PA]]
+
+## 🤖 LLM 활용
+**언제**: user-content platform 의 moderation, ranking, provenance 의 design 시.
+**언제 X**: closed editorial content (news site) — 매 UGC 무관.
+
+## ❌ 안티패턴
+- **No moderation**: 매 spam/abuse 의 platform 의 destroy.
+- **Heavy pre-moderation only**: 매 latency + cost — 매 hybrid 의 better.
+- **Naive ranking** (`order by votes desc`): 매 first-mover advantage — Wilson score 의 better.
+- **Ignore copyright**: 매 DMCA 의 ignore — legal liability.
+
+## 🧪 검증 / 중복
+- Verified (OpenAI Moderation docs; C2PA spec 2.0; OWASP UGC guidelines; DSA 2024).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — UGC lifecycle + moderation + C2PA |