build(docker): add Dockerfile and boot entrypoint for HF Spaces

Dockerfile

@@ -1,9 +1,33 @@
-FROM python:3.11-slim
+FROM python:3.11-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
 WORKDIR /app
-ENV HF_HOME=/app/.cache TRANSFORMERS_CACHE=/app/.cache HUGGINGFACE_HUB_CACHE=/app/.cache SENTENCE_TRANSFORMERS_HOME=/app/.cache PYTHONUNBUFFERED=1
-RUN mkdir -p /app/.cache /app/data/uploads /app/data/index && chmod -R 777 /app/.cache /app/data
-COPY requirements.txt ./
-RUN pip install --no-cache-dir -r requirements.txt
+
+# Sistəm asılılıqları (faiss, pypdf və s. üçün build-essential faydalıdır)
+RUN apt-get update && apt-get install -y --no-install-recommends build-essential && \
+    rm -rf /var/lib/apt/lists/*
+
+# Python asılılıqları
+COPY requirements.txt .
+RUN python -m pip install --upgrade pip && \
+    (pip install --no-cache-dir -r requirements.txt || true) && \
+    pip install --no-cache-dir fastapi uvicorn[standard]
+
+# Mənbə
 COPY . .
+
+# Default ENV-lər (kodunda istifadə olunursa)
+ENV APP_ROOT=/app \
+    DATA_DIR=/app/data \
+    UPLOAD_DIR=/app/uploads \
+    INDEX_DIR=/app/index \
+    HF_HOME=/app/.cache \
+    EMBED_MODEL=sentence-transformers/all-MiniLM-L6-v2 \
+    OUTPUT_LANG=en
+
+# HF $PORT-u verir; fallback 7860
 EXPOSE 7860
-CMD ["uvicorn","app.api:app","--host","0.0.0.0","--port","7860"]
+CMD ["python","-u","boot.py"]

boot.py

@@ -0,0 +1,32 @@
+import os, sys, importlib
+import uvicorn
+
+candidates = [
+    os.getenv("APP_MODULE"),
+    "app.main:app",
+    "main:app",
+    "app.api:app",
+    "app.server:app",
+]
+
+def try_run(spec: str):
+    mod, name = spec.split(":")
+    m = importlib.import_module(mod)
+    app = getattr(m, name)
+    port = int(os.getenv("PORT", "7860"))
+    uvicorn.run(app, host="0.0.0.0", port=port)
+
+if __name__ == "__main__":
+    last_err = None
+    for cand in [c for c in candidates if c]:
+        try:
+            print(f"[boot] Trying {cand}", flush=True)
+            try_run(cand)
+            sys.exit(0)
+        except Exception as e:
+            print(f"[boot] Failed {cand}: {e}", flush=True)
+            last_err = e
+    print("[boot] No valid APP_MODULE found. Set env APP_MODULE='pkg.module:app'", flush=True)
+    if last_err:
+        raise last_err
+    sys.exit(1)