refactor: extract/ingest facade, merge_one, deduplicate ops constants

- Add bincio/extract/ingest.py as a facade over the extract internals (ingest_parsed, strava_sync), reducing coupling from 6+ imports to one
  - Add merge_one() to merge.py — fast single-activity path for interactive edits (rewrites one file + index, skips full directory rebuild)
  - Rewrite edit/ops.py to delegate to the new facade; fix broken run_strava_sync return (was referencing undefined locals)
  - Remove duplicated SPORTS, STAT_PANELS, VALID_ACTIVITY_ID from edit/server.py — now imported from ops.py

bincio/edit/server.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import json
-import re
 import shutil
 from pathlib import Path
 from typing import Any
@@ -12,6 +11,8 @@ from fastapi import FastAPI, File, HTTPException, Request, UploadFile
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
 
+from bincio.edit.ops import SPORTS, STAT_PANELS, VALID_ACTIVITY_ID
+
 # Populated by the CLI before uvicorn starts
 data_dir: Path | None = None
 site_url: str = "http://localhost:4321"
@@ -28,18 +29,12 @@ app.add_middleware(
     allow_headers=["Content-Type"],
 )
 
-_VALID_ACTIVITY_ID = re.compile(r'^[a-zA-Z0-9][a-zA-Z0-9\-]{0,250}$')
-
-
 def _check_id(activity_id: str) -> str:
     """Reject activity IDs that contain path traversal sequences."""
-    if not _VALID_ACTIVITY_ID.match(activity_id):
+    if not VALID_ACTIVITY_ID.match(activity_id):
         raise HTTPException(400, "Invalid activity ID")
     return activity_id
 
-SPORTS = ["cycling", "running", "hiking", "walking", "swimming", "skiing", "other"]
-STAT_PANELS = ["elevation", "speed", "heart_rate", "cadence", "power"]
-
 
 # ── HTML UI ───────────────────────────────────────────────────────────────────