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/handlers/__init__.py

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+"""Event Handlers for Graph Memory TUI"""

graph_memory_tui/handlers/focus_handler.py

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+"""焦点管理器"""
+
+from textual.app import App
+
+
+class FocusHandler:
+    """焦点管理器"""
+
+    # 焦点循环顺序
+    FOCUS_RING = [
+        "input-textarea",      # 左侧输入框
+        "api-key-input",       # 右侧配置区 API Key
+        "model-input",         # 右侧配置区 Model
+        "base-url-input",      # 右侧配置区 Base URL
+        "cypher-textarea",     # 右侧 Cypher 查询框
+    ]
+
+    # 焦点名称映射
+    FOCUS_NAMES = {
+        "input-textarea": "Input",
+        "api-key-input": "Config-API",
+        "model-input": "Config-Model",
+        "base-url-input": "Config-URL",
+        "cypher-textarea": "Query",
+    }
+
+    def __init__(self):
+        self._current_index = 0
+
+    def next_focus(self, app: App) -> None:
+        """切换到下一个焦点"""
+        self._current_index = (self._current_index + 1) % len(self.FOCUS_RING)
+        widget_id = self.FOCUS_RING[self._current_index]
+        self._focus_widget(app, widget_id)
+
+    def prev_focus(self, app: App) -> None:
+        """切换到上一个焦点"""
+        self._current_index = (self._current_index - 1) % len(self.FOCUS_RING)
+        widget_id = self.FOCUS_RING[self._current_index]
+        self._focus_widget(app, widget_id)
+
+    def focus_input(self, app: App) -> None:
+        """聚焦到输入框"""
+        self._current_index = 0
+        self._focus_widget(app, self.FOCUS_RING[0])
+
+    def focus_query(self, app: App) -> None:
+        """聚焦到查询框"""
+        self._current_index = len(self.FOCUS_RING) - 1
+        self._focus_widget(app, self.FOCUS_RING[-1])
+
+    def get_current_focus_name(self) -> str:
+        """获取当前焦点名称"""
+        widget_id = self.FOCUS_RING[self._current_index]
+        return self.FOCUS_NAMES.get(widget_id, "Unknown")
+
+    def _focus_widget(self, app: App, widget_id: str) -> None:
+        """聚焦到指定组件"""
+        try:
+            widget = app.query_one(f"#{widget_id}")
+            widget.focus()
+        except Exception:
+            # 如果找不到组件，回退到输入框
+            self.focus_input(app)

graph_memory_tui/handlers/key_handler.py

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+"""快捷键处理器"""
+
+from textual.app import App
+from textual.message import Message
+from .focus_handler import FocusHandler
+
+
+class KeyHandler:
+    """快捷键处理器"""
+
+    class ShowHelp(Message):
+        """显示帮助事件"""
+        pass
+
+    class ToggleSidebar(Message):
+        """切换侧边栏事件"""
+        pass
+
+    class ToggleToolDetails(Message):
+        """切换工具详情事件"""
+        pass
+
+    class FocusQuery(Message):
+        """聚焦查询框事件"""
+        pass
+
+    class ClearHistory(Message):
+        """清屏事件"""
+        pass
+
+    class QuitApp(Message):
+        """退出应用事件"""
+        pass
+
+    def __init__(self, focus_handler: FocusHandler):
+        self._focus_handler = focus_handler
+
+    def handle_f1(self, app: App) -> None:
+        """处理 F1 键 - 显示帮助"""
+        app.post_message(self.ShowHelp())
+
+    def handle_f2(self, app: App) -> None:
+        """处理 F2 键 - 切换侧边栏"""
+        app.post_message(self.ToggleSidebar())
+
+    def handle_f3(self, app: App) -> None:
+        """处理 F3 键 - 切换工具详情"""
+        app.post_message(self.ToggleToolDetails())
+
+    def handle_f4(self, app: App) -> None:
+        """处理 F4 键 - 聚焦查询框"""
+        app.post_message(self.FocusQuery())
+
+    def handle_f5(self, app: App) -> None:
+        """处理 F5 键 - 清屏"""
+        app.post_message(self.ClearHistory())
+
+    def handle_f6(self, app: App) -> None:
+        """处理 F6 键 - 退出"""
+        app.post_message(self.QuitApp())
+
+    def handle_tab(self, app: App) -> None:
+        """处理 Tab 键 - 焦点循环"""
+        self._focus_handler.next_focus(app)
+
+    def handle_shift_tab(self, app: App) -> None:
+        """处理 Shift+Tab 键 - 反向焦点循环"""
+        self._focus_handler.prev_focus(app)

graph_memory_tui/handlers/message_handler.py

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+"""消息处理器"""
+
+from datetime import datetime
+from typing import TYPE_CHECKING
+from ..models.message import Message, ToolCall, ToolResult
+
+if TYPE_CHECKING:
+    from ..services.chat_service import ChatService
+    from ..widgets.message_history import MessageHistory
+    from ..widgets.operation_log import OperationLog
+
+
+class MessageHandler:
+    """消息处理器"""
+
+    def __init__(
+        self,
+        chat_service: "ChatService",
+        message_history: "MessageHistory",
+        operation_log: "OperationLog"
+    ):
+        self._chat_service = chat_service
+        self._message_history = message_history
+        self._operation_log = operation_log
+
+    async def handle_user_message(self, content: str) -> None:
+        """处理用户消息"""
+        # 创建用户消息
+        user_message = Message(
+            role="user",
+            content=content,
+            timestamp=datetime.now()
+        )
+
+        # 添加到历史
+        self._message_history.add_message(user_message)
+
+        # 发送到聊天服务
+        await self._process_response(content)
+
+    async def _process_response(self, user_input: str) -> None:
+        """处理响应"""
+        async for event in self._chat_service.send_message(user_input):
+            if event["type"] == "user_message":
+                # 用户消息已处理
+                pass
+
+            elif event["type"] == "assistant_message":
+                # 模型消息
+                message = Message(
+                    role="assistant",
+                    content=event["content"],
+                    timestamp=datetime.now(),
+                    tool_calls=event.get("tool_calls"),
+                    tool_results=event.get("tool_results")
+                )
+                self._message_history.add_message(message)
+
+            elif event["type"] == "tool_call":
+                # 工具调用开始
+                pass
+
+            elif event["type"] == "tool_result":
+                # 工具执行结果
+                log_entry = event["log_entry"]
+                self._operation_log.add_log(log_entry)
+
+            elif event["type"] == "error":
+                # 错误处理
+                error_message = Message(
+                    role="assistant",
+                    content=f"错误: {event['error']}",
+                    timestamp=datetime.now()
+                )
+                self._message_history.add_message(error_message)