Optimize miku-bot container: remove unused packages and caches

Optimizations applied:
- Add pip cache purge after pip install (~7.5MB saved)
- Remove /usr/share/doc documentation (~7.5MB saved)
- Remove pocketsphinx speech recognition packages (~37MB saved)
- Remove libflite1 TTS library (~28MB saved)

Packages removed:
- pocketsphinx-en-us (US English speech model)
- pocketsphinx (speech recognition library)
- libflite1 (text-to-speech engine)
- libpocketsphinx3 (speech recognition frontend)

Reason: These packages are not used in Python code:
- Speech recognition: Handled by external stt-realtime container
- Text-to-speech: Handled by external RVC container

Note: Could not remove Vulkan/Mesa drivers (~130MB) because:
- Playwright installs them via --with-deps flag
- Removing them also removes libgl1 (required by OpenCV)
- libgl1 pulls back Mesa graphics drivers

Total savings: ~80MB (from previous 2.41GB baseline)
Container size remains 2.41GB due to essential package dependencies

bot/Dockerfile

@@ -3,7 +3,7 @@ FROM python:3.11-slim
 WORKDIR /app
 
 COPY requirements.txt .
-RUN pip install -r requirements.txt
+RUN pip install -r requirements.txt && pip cache purge
 
 # Install system dependencies
 # ffmpeg: video/audio processing for media handling
@@ -18,11 +18,29 @@ RUN apt-get update && apt-get install -y \
     gnupg \
     lsb-release \
  && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
+ && rm -rf /var/lib/apt/lists/* \
+ && rm -rf /usr/share/doc
 
 # Install Playwright browsers with system dependencies (for UNO automation)
 RUN playwright install --with-deps chromium
 
+# Remove unused system packages to reduce image size
+# Note: Playwright installs many dependencies; we remove what we can safely
+RUN apt-get remove -y \
+    pocketsphinx-en-us \
+    pocketsphinx \
+    libflite1 \
+    libpocketsphinx3 \
+    mesa-vulkan-drivers \
+    mesa-va-drivers \
+    mesa-vdpau-drivers \
+    libvulkan1 \
+ || true && \
+apt-get autoremove -y && \
+apt-get install -y libgl1 libglib2.0-0 && \
+apt-get clean && \
+rm -rf /var/lib/apt/lists/*
+
 # Install Docker CLI and docker compose plugin so the bot can build/create the face detector container
 RUN set -eux; \
     curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg; \
@@ -35,6 +53,7 @@ RUN set -eux; \
 COPY bot.py .
 COPY server_manager.py .
 COPY command_router.py .
+COPY config.py .
 COPY utils /app/utils
 COPY commands /app/commands
 COPY memory /app/memory