Add fastgpt as seperate assistant mode

engine/Dockerfile

@@ -2,6 +2,11 @@ FROM python:3.12-slim
 
 WORKDIR /app
 
+# Build this image from the project parent directory so both
+# engine-v3/engine and fastgpt-python-sdk are available in the context.
+# Example:
+#   docker build -f engine-v3/engine/Dockerfile -t engine-v3 .
+
 # Install system dependencies for audio processing
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
@@ -12,11 +17,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Python dependencies
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+COPY engine-v3/engine/requirements.txt /tmp/requirements.txt
+COPY fastgpt-python-sdk /deps/fastgpt-python-sdk
+RUN pip install --no-cache-dir -r /tmp/requirements.txt \
+    && pip install --no-cache-dir /deps/fastgpt-python-sdk
 
 # Copy application code
-COPY . .
+COPY engine-v3/engine /app
 
 # Create necessary directories
 RUN mkdir -p /app/logs /app/data/vad