Remove root app.py shim; force --only-binary for torch install

The root app.py was a workaround for an analyzer issue. The real entry
point is still server/app.py and the Dockerfile starts it via uvicorn.
Forcing --only-binary=:all: on the torch install prevents pep 517 source
builds that depend on flit_core<4,>=3.11 (unavailable in the HF build
env). Also pins typing-extensions>=4.10.0 to a version with a properly
named prebuilt wheel.

Dockerfile

@@ -13,11 +13,11 @@ curl \
 
 # Pin torch to CPU-only slim wheel FIRST — prevents pip from pulling the 2.4 GB CUDA build.
 # Must be installed before sentence-transformers / bert-score resolve their torch dep.
-# 2.4.0 ships prebuilt metadata for the modern PEP 517 build flow; 2.2.2+cpu fails because
-# its build deps require flit_core<4,>=3.11 which is no longer resolvable in the current
-# HF build environment.
-RUN pip install --no-cache-dir \
+# --only-binary=:all: forces pip to use prebuilt wheels only; this avoids the PEP 517 source
+# build path that pulls flit_core<4,>=3.11 (unresolved in modern HF build envs).
+RUN pip install --no-cache-dir --only-binary=:all: \
 torch==2.4.0+cpu \
+typing-extensions>=4.10.0 \
 --index-url https://download.pytorch.org/whl/cpu
 
 # Install remaining dependencies

README.md

@@ -5,7 +5,7 @@ colorFrom: blue
 colorTo: green
 sdk: docker
 app_port: 7860
-app_file: app.py
+
 pinned: true
 tags:
   - openenv

app.py

@@ -1,33 +0,0 @@
-"""Root-level app entry point for HF Spaces.
-
-The actual FastAPI application lives in `server/app.py`. This shim re-exports
-the `app` object so HF Spaces (which expects `app.py` at the repo root) can
-discover the entry point. The Dockerfile starts the server with:
-
-    uvicorn server.app:app --host 0.0.0.0 --port 7860
-
-so this file is only used by the HF Space UI's static analyzer.
-
-Note: this file intentionally does NOT import `server.app` at module load.
-Importing it eagerly would load the dataset loader and ML models at build
-time, which is unnecessary and slow. The Dockerfile already starts the real
-app via uvicorn.
-"""
-
-import sys
-import os
-
-# Allow `from server.app import app` to work when uvicorn mirrors this file
-sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
-
-__all__ = ["app"]
-
-
-def __getattr__(name):
-    # Lazy re-export so that static analyzers (e.g. HF Space scanner) see
-    # `app` here, but the heavy module only loads when something actually
-    # imports it. `uvicorn server.app:app` does the real work.
-    if name == "app":
-        from server.app import app  # noqa: WPS433
-        return app
-    raise AttributeError(f"module 'app' has no attribute {name!r}")