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/app.css

@@ -0,0 +1,35 @@
+/* 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;
+}