revert to official python:3.12-slim, install miniconda via curl in startup.sh

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   mcp-bash:
-    image: continuumio/miniconda3:latest
+    image: python:3.12-slim
     container_name: mcp-bash
     restart: unless-stopped
     working_dir: /workspace

server/startup.sh

@@ -7,7 +7,14 @@ apt-get install -y --no-install-recommends \
     curl wget git vim nano htop procps jq less unzip zip \
     build-essential ca-certificates
 
-# ─── Python dependencies (via conda base env) ─────────────────────────────────
+# ─── Miniconda ────────────────────────────────────────────────────────────────
+curl -fsSL https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -o /tmp/miniconda.sh
+bash /tmp/miniconda.sh -b -p /opt/miniconda3
+rm /tmp/miniconda.sh
+export PATH="/opt/miniconda3/bin:$PATH"
+conda init bash
+
+# ─── Python dependencies ──────────────────────────────────────────────────────
 pip install -q -r /app/requirements.txt
 
 # ─── Node.js via nvm ──────────────────────────────────────────────────────────