feat: move tini to base image

All dependencies now in base image:
✅ Python 3.11
✅ Node.js 20
✅ bun, npm
✅ Build tools (gcc, g++, make)
✅ Runtime essentials (curl, ca-certificates)
✅ tini (init system)

Result:
• Runtime stage needs ZERO installations
• Just copy files from builder
• Pure base image usage 🚀

docker/Dockerfile

@@ -84,15 +84,12 @@ RUN groupadd -r peikarband && \
 
 WORKDIR /app
 
-# Base image already has:
+# Base image already has everything we need:
 # - Python 3.11
 # - Node.js 20
 # - curl, ca-certificates
-# Just need to add tini for proper init
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    tini \
-    && rm -rf /var/lib/apt/lists/* \
-    && apt-get clean
+# - tini (for proper init)
+# No additional packages needed!
 
 # Copy Python dependencies from builder
 COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages