Final: Complete modernization - Option 1 deployment, unified persistence, migration scripts

- Implement Docker image-based deployment (Option 1)
  * Code immutable in image, no volume override
  * Eliminated init-data.sh manual step
  * Simplified deployment process

- Unified persistence in data/ folder
  * Moved nginx.conf and nginx-custom-domains.conf to data/
  * All runtime configs and data in single location
  * Clear separation: repo (source) vs data/ (runtime)

- Archive legacy features
  * Groups blueprint and templates removed
  * Legacy playlist routes redirected to content area
  * Organized in old_code_documentation/

- Added network migration support
  * New migrate_network.sh script for IP changes
  * Regenerates SSL certs for new IP
  * Updates database configuration
  * Tested workflow: clone → deploy → migrate

- Enhanced deploy.sh
  * Creates data directories
  * Copies nginx configs from repo to data/
  * Validates file existence before deployment
  * Prevents incomplete deployments

- Updated documentation
  * QUICK_DEPLOYMENT.md shows 4-step workflow
  * Complete deployment workflow documented
  * Migration procedures included

- Production ready deployment workflow:
  1. Clone & setup (.env configuration)
  2. Deploy (./deploy.sh)
  3. Migrate network (./migrate_network.sh if needed)
  4. Normal operations (docker compose restart)

old_code_documentation/templates_groups/create_group.html

@@ -0,0 +1,21 @@
+{% extends "base.html" %}
+
+{% block title %}Create Group - DigiServer v2{% endblock %}
+
+{% block content %}
+<h1>Create Group</h1>
+<div class="card">
+    <form method="POST">
+        <div style="margin-bottom: 1rem;">
+            <label>Group Name</label>
+            <input type="text" name="name" required style="width: 100%; padding: 0.5rem;">
+        </div>
+        <div style="margin-bottom: 1rem;">
+            <label>Description (optional)</label>
+            <textarea name="description" rows="3" style="width: 100%; padding: 0.5rem;"></textarea>
+        </div>
+        <button type="submit" class="btn btn-success">Create Group</button>
+        <a href="{{ url_for('groups.groups_list') }}" class="btn">Cancel</a>
+    </form>
+</div>
+{% endblock %}