Initial Cezen AI Suite installer — Entry tier

ansible/roles/jupyterlab/tasks/main.yml

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+---
+# JupyterLab — notebook interface for AI/ML development
+- name: Install JupyterLab in cezen conda env
+  become_user: cezen
+  shell: |
+    /opt/cezen/miniconda/bin/conda run -n cezen pip install \
+      jupyterlab \
+      ipywidgets \
+      ipykernel \
+      notebook \
+      nbconvert
+  retries: 3
+  delay: 10
+
+- name: Create JupyterLab config directory
+  file:
+    path: /opt/cezen/.jupyter
+    state: directory
+    owner: cezen
+    group: cezen
+
+- name: Generate JupyterLab config
+  become_user: cezen
+  shell: |
+    /opt/cezen/miniconda/envs/cezen/bin/jupyter lab --generate-config
+  args:
+    creates: /opt/cezen/.jupyter/jupyter_lab_config.py
+
+- name: Configure JupyterLab (no browser, allow all IPs, set base dir)
+  lineinfile:
+    path: /opt/cezen/.jupyter/jupyter_lab_config.py
+    line: "{{ item }}"
+    create: yes
+    owner: cezen
+  loop:
+    - "c.ServerApp.ip = '0.0.0.0'"
+    - "c.ServerApp.port = 8888"
+    - "c.ServerApp.open_browser = False"
+    - "c.ServerApp.notebook_dir = '/opt/cezen/notebooks'"
+    - "c.ServerApp.token = 'cezen2024'"
+    - "c.ServerApp.allow_root = False"
+
+- name: Create notebooks directory
+  file:
+    path: /opt/cezen/notebooks
+    state: directory
+    owner: cezen
+    group: cezen
+
+- name: Create sample notebook placeholder
+  copy:
+    dest: /opt/cezen/notebooks/README.md
+    content: |
+      # Cezen AI Suite — JupyterLab
+
+      Default token: `cezen2024`
+
+      Change this in: `/opt/cezen/.jupyter/jupyter_lab_config.py`
+      Then restart: `sudo systemctl restart jupyterlab`
+    owner: cezen
+    group: cezen
+
+- name: Create JupyterLab systemd service
+  copy:
+    dest: /etc/systemd/system/jupyterlab.service
+    content: |
+      [Unit]
+      Description=JupyterLab Server
+      After=network.target
+
+      [Service]
+      Type=simple
+      User=cezen
+      Group=cezen
+      WorkingDirectory=/opt/cezen/notebooks
+      ExecStart=/opt/cezen/miniconda/envs/cezen/bin/jupyter lab \
+        --config=/opt/cezen/.jupyter/jupyter_lab_config.py
+      Restart=always
+      RestartSec=5
+      Environment="PATH=/opt/cezen/miniconda/envs/cezen/bin:/usr/local/cuda/bin:/usr/local/bin:/usr/bin:/bin"
+      Environment="CUDA_HOME=/usr/local/cuda"
+
+      [Install]
+      WantedBy=multi-user.target
+    mode: "0644"
+
+- name: Enable and start JupyterLab
+  systemd:
+    name: jupyterlab
+    enabled: yes
+    state: started
+    daemon_reload: yes