feat: add Jupyter extension (Wave 1, Light-Heart-Labs#9 priority)

Author: Android-16

dream-server/extensions/services/jupyter/README.md

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+# Jupyter Extension for Dream Server
+
+## Overview
+
+Jupyter Notebook is an open-source web application for creating and sharing computational documents. This extension provides a full-featured data science environment with Python, scipy stack, and GPU support.
+
+## Features
+
+- JupyterLab interface (modern, extensible)
+- Pre-installed: NumPy, Pandas, SciPy, Matplotlib, Scikit-learn
+- GPU acceleration support (CUDA-enabled)
+- Persistent storage for notebooks
+- Optional token-based authentication
+
+## Usage
+
+### Enable the extension
+
+```bash
+dream extensions enable jupyter
+```
+
+### Access Jupyter
+
+```
+http://localhost:${JUPYTER_PORT:-8888}
+```
+
+If `JUPYTER_TOKEN` is set, use it to log in. If empty (default), no authentication required.
+
+### Set a custom token
+
+Edit `.env`:
+
+```
+JUPYTER_TOKEN=your-secret-token
+```
+
+## Configuration
+
+| Environment Variable | Default | Description |
+|---------------------|---------|-------------|
+| `JUPYTER_PORT` | 8888 | Web UI port |
+| `JUPYTER_TOKEN` | (empty) | Auth token (empty = no auth) |
+
+## Integration
+
+Jupyter connects to Dream Server's LLM API:
+- Use `${LLM_API_URL}` in notebooks for API calls
+- Query local models directly from Python code
+
+Example:
+```python
+import requests
+
+response = requests.post(f"{os.environ['LLM_API_URL']}/v1/chat/completions", ...)
+```
+
+## Uninstall
+
+```bash
+dream extensions disable jupyter
+```
+
+Notebooks in `./data/jupyter/` are preserved.

dream-server/extensions/services/jupyter/compose.yaml

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+name: jupyter
+
+services:
+  jupyter:
+    image: jupyter/scipy-notebook:notebook-7.3.3
+    container_name: jupyter
+    ports:
+      - "${JUPYTER_PORT:-8888}:8888"
+    volumes:
+      - ./data/jupyter:/home/jovyan/work
+    environment:
+      - JUPYTER_ENABLE_LAB=yes
+      - JUPYTER_TOKEN=${JUPYTER_TOKEN:-}
+      - LLM_API_URL=${LLM_API_URL:-http://localhost:8000}
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://localhost:8888/api"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 60s
+    networks:
+      - dream-network
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: all
+              capabilities: [gpu]
+
+networks:
+  dream-network:
+    external: true
+    name: dream-network

dream-server/extensions/services/jupyter/manifest.yaml

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+name: jupyter
+version: "1.0.0"
+description: Jupyter Notebook - Interactive data science and coding environment
+category: tool
+authors:
+  - Project Jupyter
+website: https://jupyter.org/
+image: jupyter/scipy-notebook:notebook-7.3.3
+gpu: [amd, nvidia]
+port: 8888
+data:
+  - ./data/jupyter:/home/jovyan/work
+healthcheck:
+  - wget -q --spider http://localhost:8888/api
+env:
+  - LLM_API_URL
+dependencies: []
+tags: [notebook, python, data-science, coding]