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/messages.css

@@ -0,0 +1,24 @@
+/* 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;
+}