engine: remove dead archive handlers (front serves archive now)

The archive endpoints (list/get/delete/file/settings) are served by the front
(codai/frontproxy/admin_data.py, from disk via archive_manager), so the engine's
copies in admin/routes.py were dead. Removed.

Note: the cache/download/HF handlers in routes.py are NOT removed — the
coderai-system worker serves them through the same admin_router, so they're only
unrouted on the engine, not dead code. Fully removing them from the engine would
require splitting routes.py into engine vs system routers (future cleanup).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011DDv7BchtZQWsnPG6Jm49m

codai/admin/routes.py

@@ -3447,77 +3447,6 @@ async def api_save_settings(request: Request, username: str = Depends(require_ad
 # Archive management
 # =============================================================================
 
-@router.get("/admin/api/archive", summary="List archived generations")
-async def api_archive_list(
-    limit: int = 50,
-    offset: int = 0,
-    username: str = Depends(require_admin),
-):
-    from codai.api.archive import archive_manager
-    entries = archive_manager.list_entries(limit=limit, offset=offset)
-    total = archive_manager.count_entries()
-    return {"entries": entries, "total": total}
-
-
-@router.get("/admin/api/archive/{gen_id}", summary="Get an archived generation")
-async def api_archive_get(gen_id: str, username: str = Depends(require_admin)):
-    from codai.api.archive import archive_manager
-    entry = archive_manager.get_entry(gen_id)
-    if entry is None:
-        raise HTTPException(status_code=404, detail="Entry not found")
-    return entry
-
-
-@router.delete("/admin/api/archive/{gen_id}", summary="Delete an archived generation")
-async def api_archive_delete(gen_id: str, username: str = Depends(require_admin)):
-    from codai.api.archive import archive_manager
-    if not archive_manager.delete_entry(gen_id):
-        raise HTTPException(status_code=404, detail="Entry not found")
-    return {"success": True}
-
-
-@router.get("/admin/api/archive/{gen_id}/files/{filename}", summary="Download an archived file")
-async def api_archive_file(
-    gen_id: str,
-    filename: str,
-    username: str = Depends(require_auth),
-):
-    from fastapi.responses import FileResponse
-    from codai.api.archive import archive_manager
-    path = archive_manager.get_file_path(gen_id, filename)
-    if path is None:
-        raise HTTPException(status_code=404, detail="File not found")
-    import mimetypes
-    media_type = mimetypes.guess_type(filename)[0] or "application/octet-stream"
-    return FileResponse(path, media_type=media_type)
-
-
-@router.get("/admin/api/archive-settings", summary="Get archive settings")
-async def api_archive_settings_get(username: str = Depends(require_admin)):
-    if config_manager is None or config_manager.config is None:
-        raise HTTPException(status_code=503, detail="Config not ready")
-    import os as _os
-    c = config_manager.config.archive
-    from codai.api.archive import RETENTION_OPTIONS
-    default_dir = _os.path.join(str(config_manager.config_dir), "archive")
-    return {
-        "enabled": c.enabled,
-        "directory": c.directory,
-        "default_directory": default_dir,
-        "retention": c.retention,
-        "retention_options": RETENTION_OPTIONS,
-    }
-
-
-# --- HuggingFace model search proxy ---
-
-import re as _re
-_QUANT_RE = _re.compile(
-    r'\b(IQ[1-4]_XX[SML]?|Q[2-8]_K_[MSLX]|Q[2-8]_K|Q[2-8]_[0-9]|F16|F32|BF16)\b',
-    _re.IGNORECASE,
-)
-
-
 def _hf_file_size(sibling: dict) -> int:
     """Return actual byte size from an HF siblings entry (prefers LFS size)."""
     lfs = sibling.get("lfs") or {}