Fix: F3 tool details toggle, sidebar width, and sync docs with code

- Fix F3 tool details: use display:none/block instead of re-compose
- Increase sidebar width from 40 to 70 for readability
- Sync 一键启动指南.md with actual entry points (trulymem_entry.py)
- Rewrite 工作记忆链机制说明.md with actual task_* tool APIs
- Rewrite 架构.md with actual file structure (38 Python files)
- Update docs/README.md with complete feature list

graph_memory_tui/styles/app.css

@@ -22,7 +22,7 @@ LeftPanel {
 }
 
 RightPanel {
-    width: 40;
+    width: 70;
     dock: right;
     background: $panel;
     overflow-y: auto;

graph_memory_tui/styles/components.css

@@ -57,6 +57,18 @@ OperationLog {
     height: 1fr;
     margin: 1;
     overflow-y: auto;
+    padding: 1;
+}
+
+OperationLog .log-entry {
+    color: $text;
+    margin: 0 0 1 0;
+    height: auto;
+}
+
+OperationLog .log-empty {
+    color: $text-muted;
+    text-style: italic;
 }
 
 CypherQueryBox {