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/agent_detail.html

@@ -0,0 +1,60 @@
+{% extends "base.html" %}
+
+{% block title %}{{ agent.name }} – Agent Platform{% endblock %}
+
+{% block content %}
+<div class="page-header">
+    <h1>{{ agent.name }}</h1>
+    <p class="subtitle"><code>{{ agent.id }}</code> · {{ agent.description }}</p>
+</div>
+
+<section class="card">
+    <h2>Definition (aus Code)</h2>
+    <p><small>Diese Definition liegt in <code>agents/*.py</code> und ist read-only im UI. Änderungen am Code erfordern Server-Neustart.</small></p>
+    <div class="form-group">
+        <label>System-Prompt</label>
+        <textarea readonly rows="10">{{ agent.system_prompt }}</textarea>
+    </div>
+    <div class="form-group">
+        <label>Erlaubte Tools</label>
+        <input type="text" value="{{ agent.allowed_tools|join(', ') }}" readonly>
+    </div>
+    {% if agent.model %}
+    <div class="form-group">
+        <label>LLM-Override</label>
+        <input type="text" value="{{ agent.model }}" readonly>
+    </div>
+    {% endif %}
+</section>
+
+<section class="card">
+    <h2>Runtime-Settings</h2>
+    <form hx-put="/api/agents/{{ agent.id }}" hx-target="#settings-result" class="form">
+        <div class="form-group">
+            <label>
+                <input type="checkbox" name="enabled" {% if agent.enabled %}checked{% endif %} value="true">
+                Aktiv (Agent darf verwendet werden)
+            </label>
+        </div>
+        <div class="form-group">
+            <label>Custom-Settings (JSON, optional)</label>
+            <textarea name="custom_settings" rows="4" placeholder='{"temperature": 0.5, "max_tokens": 1000}'>{{ agent.custom_settings | tojson(indent=2) if agent.custom_settings else "{}" }}</textarea>
+        </div>
+        <button type="submit" class="btn btn-primary">Settings speichern</button>
+        <a href="/agents" class="btn">Zurück</a>
+    </form>
+    <div id="settings-result"></div>
+</section>
+
+<section class="card">
+    <h2>Chat starten</h2>
+    <form hx-post="/api/chat/{{ agent.id }}" hx-target="#chat-result" hx-swap="innerHTML" class="form">
+        <div class="form-group">
+            <label>Erste Nachricht</label>
+            <textarea name="message" rows="3" required placeholder="Hallo!"></textarea>
+        </div>
+        <button type="submit" class="btn btn-primary">Chat starten</button>
+    </form>
+    <div id="chat-result"></div>
+</section>
+{% endblock %}