feat: agent platform initial commit

- FastAPI + HTMX UI: dashboard, agents CRUD, chat, audit, tools
- SQLite schema: agents, conversations, messages, audit, sessions
- Code-agent sync (agents/*.py -> DB on startup)
- MCP client with health check
- Token auth (Bearer + session)
- LiteLLM integration via llm.py
- Docker Compose: agent-platform + mcp-tools services
- Smoke tests pass: /health 200, /api/agents 200, / 401

agent_platform/templates/chat.html

@@ -0,0 +1,36 @@
+{% extends "base.html" %}
+
+{% block title %}Chat – Agent Platform{% endblock %}
+
+{% block content %}
+<div class="page-header">
+    <h1>Chat</h1>
+    <p class="subtitle">Konversation: <code>{{ conv_id }}</code></p>
+</div>
+
+<section class="card chat-container">
+    <div id="messages" class="messages">
+        {% for msg in messages %}
+        <div class="message message-{{ msg.role }}">
+            <div class="message-role">{{ msg.role }}</div>
+            <div class="message-content">{{ msg.content }}</div>
+        </div>
+        {% endfor %}
+        {% if not messages %}
+        <p class="empty-state">Noch keine Nachrichten.</p>
+        {% endif %}
+    </div>
+</section>
+
+<section class="card">
+    <form hx-post="" hx-target="#messages" hx-swap="beforeend" hx-on::after-request="this.reset()" class="form" id="chat-form">
+        <input type="hidden" name="conv_id" value="{{ conv_id }}">
+        <div class="form-row">
+            <div class="form-group" style="flex: 1;">
+                <textarea name="message" rows="2" required placeholder="Nachricht eingeben..." autofocus></textarea>
+            </div>
+            <button type="submit" class="btn btn-primary">Senden</button>
+        </div>
+    </form>
+</section>
+{% endblock %}