Initial commit: YouTube Shorts maker application

Features:
- Video download from TikTok/Douyin using yt-dlp
- Audio transcription with OpenAI Whisper
- GPT-4 translation (direct/summarize/rewrite modes)
- Subtitle generation with ASS format
- Video trimming with frame-accurate preview
- BGM integration with volume control
- Intro text overlay support
- Thumbnail generation with text overlay

Tech stack:
- Backend: FastAPI, Python 3.11+
- Frontend: React, Vite, TailwindCSS
- Video processing: FFmpeg
- AI: OpenAI Whisper, GPT-4

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/routers/fonts.py

@@ -0,0 +1,163 @@
+"""
+Fonts Router - Korean font management for subtitles.
+
+Provides font listing and recommendations for YouTube Shorts subtitles.
+"""
+
+from fastapi import APIRouter, HTTPException
+from app.models.schemas import FontInfo, KOREAN_FONTS, FONT_RECOMMENDATIONS
+
+router = APIRouter()
+
+
+@router.get("/")
+async def list_fonts():
+    """
+    List all available Korean fonts for subtitles.
+
+    Returns font information including:
+    - id: System font name to use in subtitle_style.font_name
+    - name: Display name in Korean
+    - style: Font style description
+    - recommended_for: Content types this font works well with
+    - download_url: Where to download the font
+    - license: Font license information
+    """
+    fonts = []
+    for font_id, font_info in KOREAN_FONTS.items():
+        fonts.append({
+            "id": font_info.id,
+            "name": font_info.name,
+            "style": font_info.style,
+            "recommended_for": font_info.recommended_for,
+            "download_url": font_info.download_url,
+            "license": font_info.license,
+        })
+
+    return {
+        "fonts": fonts,
+        "total": len(fonts),
+        "default": "NanumGothic",
+        "usage": "Set subtitle_style.font_name to the font id",
+    }
+
+
+@router.get("/recommend/{content_type}")
+async def recommend_fonts(content_type: str):
+    """
+    Get font recommendations for a specific content type.
+
+    Available content types:
+    - tutorial: 튜토리얼, 강의
+    - gaming: 게임, 리액션
+    - cooking: 요리, 먹방
+    - comedy: 코미디, 유머
+    - travel: 여행, 브이로그
+    - news: 뉴스, 정보
+    - asmr: ASMR, 릴렉스
+    - fitness: 운동, 피트니스
+    - tech: 기술, IT
+    - lifestyle: 라이프스타일, 일상
+    """
+    content_type_lower = content_type.lower()
+
+    if content_type_lower not in FONT_RECOMMENDATIONS:
+        available_types = list(FONT_RECOMMENDATIONS.keys())
+        raise HTTPException(
+            status_code=404,
+            detail=f"Unknown content type. Available: {', '.join(available_types)}"
+        )
+
+    recommended_ids = FONT_RECOMMENDATIONS[content_type_lower]
+    recommendations = []
+
+    for font_id in recommended_ids:
+        if font_id in KOREAN_FONTS:
+            font = KOREAN_FONTS[font_id]
+            recommendations.append({
+                "id": font.id,
+                "name": font.name,
+                "style": font.style,
+                "download_url": font.download_url,
+            })
+
+    return {
+        "content_type": content_type_lower,
+        "recommendations": recommendations,
+        "primary": recommended_ids[0] if recommended_ids else "NanumGothic",
+    }
+
+
+@router.get("/categories")
+async def list_font_categories():
+    """
+    List fonts grouped by style category.
+    """
+    categories = {
+        "clean": {
+            "name": "깔끔/모던",
+            "description": "정보성 콘텐츠, 튜토리얼에 적합",
+            "fonts": ["Pretendard", "SpoqaHanSansNeo", "NanumGothic"],
+        },
+        "friendly": {
+            "name": "친근/둥글",
+            "description": "일상, 라이프스타일 콘텐츠에 적합",
+            "fonts": ["GmarketSans", "NanumSquareRound", "Cafe24SsurroundAir"],
+        },
+        "handwriting": {
+            "name": "손글씨/캐주얼",
+            "description": "먹방, 요리, 유머 콘텐츠에 적합",
+            "fonts": ["BMDoHyeon", "BMJua", "DoHyeon"],
+        },
+        "impact": {
+            "name": "강조/임팩트",
+            "description": "게임, 하이라이트, 리액션에 적합",
+            "fonts": ["Cafe24Ssurround", "BlackHanSans"],
+        },
+    }
+
+    # Add font details to each category
+    for category_id, category_info in categories.items():
+        font_details = []
+        for font_id in category_info["fonts"]:
+            if font_id in KOREAN_FONTS:
+                font = KOREAN_FONTS[font_id]
+                font_details.append({
+                    "id": font.id,
+                    "name": font.name,
+                })
+        category_info["font_details"] = font_details
+
+    return {
+        "categories": categories,
+    }
+
+
+@router.get("/{font_id}")
+async def get_font(font_id: str):
+    """
+    Get detailed information about a specific font.
+    """
+    if font_id not in KOREAN_FONTS:
+        available_fonts = list(KOREAN_FONTS.keys())
+        raise HTTPException(
+            status_code=404,
+            detail=f"Font not found. Available fonts: {', '.join(available_fonts)}"
+        )
+
+    font = KOREAN_FONTS[font_id]
+    return {
+        "id": font.id,
+        "name": font.name,
+        "style": font.style,
+        "recommended_for": font.recommended_for,
+        "download_url": font.download_url,
+        "license": font.license,
+        "usage_example": {
+            "subtitle_style": {
+                "font_name": font.id,
+                "font_size": 36,
+                "position": "center",
+            }
+        },
+    }