Initial commit: Add T YouTube text-based reader web app

- FastAPI backend running on port 8000
- Svelte 5 runes frontend dashboard supporting Read/Skip state toggles
- YouTube subscription feed scraper using yt-dlp & Netscape cookies.txt
- Transcript downloader and Claude 3.5 Haiku summarizer via bytecatcode proxy
- Multi-stage Dockerfile and docker-compose.yml configuration

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/db.py

@@ -0,0 +1,34 @@
+import os
+import aiosqlite
+
+DB_DIR = os.environ.get("DB_DIR", os.path.dirname(os.path.abspath(__file__)))
+DB_PATH = os.path.join(DB_DIR, "t_youtube.db")
+
+async def init_db():
+    os.makedirs(os.path.dirname(DB_PATH), exist_ok=True)
+    async with aiosqlite.connect(DB_PATH) as db:
+        await db.execute("""
+            CREATE TABLE IF NOT EXISTS videos (
+                video_id TEXT PRIMARY KEY,
+                title TEXT NOT NULL,
+                channel_name TEXT,
+                channel_id TEXT,
+                url TEXT NOT NULL,
+                thumbnail_url TEXT,
+                publish_date TEXT,
+                duration INTEGER,
+                transcript TEXT,
+                summary TEXT,
+                status TEXT DEFAULT 'pending',
+                created_at TEXT DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        await db.commit()
+
+async def get_db():
+    db = await aiosqlite.connect(DB_PATH)
+    db.row_factory = aiosqlite.Row
+    try:
+        yield db
+    finally:
+        await db.close()