feat(ansible): inventory groups CRUD routes + templates + blueprint registration

steward/templates/ansible/inventory/group_detail.html

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+{% extends "base.html" %}
+{% block title %}Group: {{ group.name }} — Steward{% endblock %}
+{% block content %}
+<div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;">
+    <h1 class="page-title" style="margin-bottom:0;">Group: {{ group.name }}</h1>
+    <a href="/ansible/inventory/groups" class="btn btn-ghost btn-sm">← Groups</a>
+</div>
+
+<form method="post" action="/ansible/inventory/groups/{{ group.id }}">
+    <div class="card" style="margin-bottom:1.5rem;">
+        <h3 class="section-title">Settings</h3>
+        <div class="form-group">
+            <label>Name</label>
+            <input type="text" name="name" value="{{ group.name }}" required>
+        </div>
+        <div class="form-group">
+            <label>
+                Group Variables
+                <span style="color:var(--text-muted);font-weight:normal;font-size:0.82rem;">
+                    (YAML — applied to all members; per-target vars override these)
+                </span>
+            </label>
+            <textarea name="ansible_vars" rows="8"
+                      style="width:100%;font-family:ui-monospace,monospace;font-size:0.85rem;"
+                      placeholder="ansible_user: deploy&#10;http_port: 80">{{ ansible_vars_yaml }}</textarea>
+        </div>
+    </div>
+
+    <div class="card" style="margin-bottom:1.5rem;">
+        <h3 class="section-title">Members</h3>
+        {% if not all_targets %}
+        <p style="color:var(--text-muted);font-size:0.9rem;">No targets exist yet.
+            <a href="/ansible/inventory/targets">Add targets</a> first.</p>
+        {% else %}
+        <div style="display:grid;gap:0.4rem;margin-bottom:1rem;">
+            {% for tgt in all_targets %}
+            <label style="display:flex;align-items:center;gap:0.6rem;font-weight:normal;cursor:pointer;">
+                <input type="checkbox" name="target_ids" value="{{ tgt.id }}"
+                       {% if tgt.id in member_ids %}checked{% endif %}>
+                <span>{{ tgt.name }}</span>
+                <span style="color:var(--text-muted);font-size:0.82rem;">{{ tgt.address }}</span>
+            </label>
+            {% endfor %}
+        </div>
+        {% endif %}
+    </div>
+
+    <button type="submit" class="btn">Save Changes</button>
+</form>
+{% endblock %}

steward/templates/ansible/inventory/groups.html

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+{% extends "base.html" %}
+{% block title %}Inventory Groups — Steward{% endblock %}
+{% block content %}
+<div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;">
+    <h1 class="page-title" style="margin-bottom:0;">Inventory Groups</h1>
+    <a href="/ansible/inventory/targets" class="btn btn-ghost btn-sm">Targets →</a>
+</div>
+
+<div class="card" style="margin-bottom:1.5rem;">
+    <h3 class="section-title">New Group</h3>
+    <form method="post" action="/ansible/inventory/groups" style="display:flex;gap:0.75rem;align-items:flex-end;">
+        <div class="form-group" style="flex:1;margin:0;">
+            <label>Name</label>
+            <input type="text" name="name" placeholder="webservers" required>
+        </div>
+        <button type="submit" class="btn">Create</button>
+    </form>
+</div>
+
+{% if not groups %}
+<div class="card">
+    <p style="color:var(--text-muted);">No groups yet. Create one above.</p>
+</div>
+{% else %}
+<div class="card-flush">
+<table class="table">
+    <thead>
+        <tr><th>Name</th><th>Members</th><th></th></tr>
+    </thead>
+    <tbody>
+    {% for grp in groups %}
+    <tr>
+        <td><strong>{{ grp.name }}</strong></td>
+        <td style="color:var(--text-muted);font-size:0.9rem;">{{ grp.targets | length }}</td>
+        <td class="td-actions">
+            <a href="/ansible/inventory/groups/{{ grp.id }}" class="btn btn-sm btn-ghost">Edit</a>
+            <form method="post" action="/ansible/inventory/groups/{{ grp.id }}/delete" style="display:inline;">
+                <button type="submit" class="btn btn-sm btn-danger"
+                        onclick="return confirm('Delete group {{ grp.name }}?')">×</button>
+            </form>
+        </td>
+    </tr>
+    {% endfor %}
+    </tbody>
+</table>
+</div>
+{% endif %}
+{% endblock %}