feat: add FastAPI app with file listing endpoint

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/routes/export.py

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+from fastapi import APIRouter
+
+router = APIRouter()

server/routes/files.py

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+import os
+
+from fastapi import APIRouter, Query
+from fastapi.responses import FileResponse
+
+from ..config import MEDIA_DIRS, VIDEO_EXTENSIONS
+
+router = APIRouter()
+
+
+def _scan_videos(root: str) -> list[dict]:
+    results = []
+    for dirpath, _, filenames in os.walk(root):
+        for f in sorted(filenames):
+            if os.path.splitext(f)[1].lower() in VIDEO_EXTENSIONS:
+                full = os.path.join(dirpath, f)
+                rel = os.path.relpath(full, root)
+                results.append({
+                    "name": f,
+                    "path": rel,
+                    "root": root,
+                    "size": os.path.getsize(full),
+                })
+    return results
+
+
+@router.get("/files")
+def list_files(root: str | None = Query(None)):
+    dirs = [root] if root and root in MEDIA_DIRS else MEDIA_DIRS
+    files = []
+    for d in dirs:
+        files.extend(_scan_videos(d))
+    return files
+
+
+@router.get("/roots")
+def list_roots():
+    return MEDIA_DIRS
+
+
+@router.get("/video/{path:path}")
+def serve_video(path: str, root: str = Query(...)):
+    if root not in MEDIA_DIRS:
+        return {"error": "invalid root"}
+    full = os.path.join(root, path)
+    if not os.path.isfile(full):
+        return {"error": "not found"}
+    return FileResponse(full, media_type="video/mp4")

server/routes/hidden.py

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+from fastapi import APIRouter
+
+router = APIRouter()

server/routes/markers.py

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+from fastapi import APIRouter
+
+router = APIRouter()

server/routes/stream.py

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+from fastapi import APIRouter
+
+router = APIRouter()