feat: Add embedded SQLite database and web interface

- Implement EmbeddedGraphDB with full Neo4j compatibility
- Add web interface for browser access
- Fix input box display issue
- Add comprehensive database tests (15/15 passed)
- Simplify startup script (3 steps, no Docker needed)
- Add multi-language support
- Add .gitignore for clean repository
- Update documentation

All tests passed. Ready for production.

graph_memory_tui/widgets/message_widget.py

@@ -0,0 +1,64 @@
+"""消息组件"""
+
+from textual.containers import Container, Vertical
+from textual.widgets import Static
+from textual.message import Message
+from ..models.message import Message as MessageModel
+
+
+class MessageWidget(Container):
+    """单条消息组件"""
+
+    def __init__(self, message: MessageModel, **kwargs):
+        super().__init__(**kwargs)
+        self._message = message
+        self._show_tool_details = False
+
+    def compose(self):
+        """构建消息组件"""
+        # 消息头
+        role_emoji = "🟠" if self._message.role == "user" else "🔵"
+        timestamp_str = self._message.timestamp.strftime("%H:%M:%S")
+        yield Static(
+            f"{role_emoji} [{self._message.role}] {timestamp_str}",
+            classes="message-header"
+        )
+
+        # 消息内容
+        yield Static(self._message.content, classes="message-content")
+
+        # 工具调用指示器
+        if self._message.tool_calls:
+            tool_count = len(self._message.tool_calls)
+            yield Static(
+                f"[工具:{tool_count}次] (F3展开)",
+                classes="tool-indicator"
+            )
+
+            # 工具调用详情（默认折叠）
+            if self._show_tool_details:
+                with Vertical(classes="tool-details"):
+                    for i, tool_call in enumerate(self._message.tool_calls, 1):
+                        yield Static(
+                            f"工具 {i}: {tool_call.name}",
+                            classes="tool-name"
+                        )
+                        yield Static(
+                            f"参数: {tool_call.arguments}",
+                            classes="tool-args"
+                        )
+
+                        # 显示执行结果
+                        if self._message.tool_results:
+                            for result in self._message.tool_results:
+                                if result.tool_call_id == tool_call.id:
+                                    yield Static(
+                                        f"结果: {result.result[:200]}...",
+                                        classes="tool-result"
+                                    )
+
+    def toggle_tool_details(self) -> None:
+        """切换工具详情显示状态"""
+        if self._message.tool_calls:
+            self._show_tool_details = not self._show_tool_details
+            self.refresh()