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/styles/__init__.py

@@ -0,0 +1 @@
+"""Styles for Graph Memory TUI"""

graph_memory_tui/styles/app.css

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+/* Global Styles for Graph Memory TUI */
+
+GraphMemoryApp {
+    background: $surface;
+    color: $text;
+}
+
+LeftPanel {
+    width: 1fr;
+    height: 100%;
+    dock: left;
+}
+
+LeftPanel MessageHistory {
+    height: 1fr;
+}
+
+LeftPanel InputBox {
+    height: 3;
+    dock: bottom;
+}
+
+RightPanel {
+    width: 40;
+    height: 100%;
+    dock: right;
+    background: $panel;
+}
+
+StatusBar {
+    dock: bottom;
+    height: 1;
+    background: $primary;
+    color: $text-primary;
+}

graph_memory_tui/styles/components.css

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+/* Component Styles for Graph Memory TUI */
+
+InputBox {
+    border: solid orange;
+    height: 3;
+    margin: 1;
+    padding: 1;
+}
+
+InputBox:focus {
+    border: double orange;
+    text-style: bold;
+}
+
+InputBox Input {
+    width: 1fr;
+    height: 1;
+    background: $surface;
+    color: $text;
+    border: none;
+}
+
+InputBox Input:focus {
+    background: $surface-lighten-1;
+}
+
+ConfigSection {
+    background: $panel;
+    margin: 1;
+}
+
+OperationLog {
+    background: $surface-darken-1;
+    height: 1fr;
+    margin: 1;
+}
+
+CypherQueryBox {
+    border: solid green;
+    margin: 1;
+}
+
+MessageHistory {
+    height: 1fr;
+    margin: 1;
+}

graph_memory_tui/styles/messages.css

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+/* Message Styles for Graph Memory TUI */
+
+UserMessage {
+    border: solid orange;
+    margin: 1 0;
+    padding: 1;
+}
+
+ModelMessage {
+    border: solid blue;
+    margin: 1 0;
+    padding: 1;
+}
+
+ToolCallIndicator {
+    color: yellow;
+    text-style: bold;
+}
+
+ToolCallDetails {
+    background: $surface-darken-1;
+    margin: 1 0 0 2;
+    padding: 1;
+}