use uv pip, it's faster, remove unneeded apt pkgs

Dockerfile

@@ -19,16 +19,15 @@ WORKDIR /app
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    build-essential \
-    gosu \
-    git \
-    ffmpeg \
+    ffmpeg gosu\
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Python dependencies
 COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /bin/
+RUN uv pip install --system -r requirements.txt
 
 # Copy application code (excluding UI source and TS source)
 COPY . .