新增资源依赖图模型、去重、环检测与上下游查询。

使用原生 SVG 渲染资源引用和聚合任务流，并接入搜索、高亮、拖动及生命周期清理。

修复资源自引用连线被卡片遮挡的问题。

补充前端回归测试并同步工作台 PRD、技术方案和决策记录。

@@ -0,0 +542,4 @@
+        draft.status = AssetCanvasDraftStatus::Generating;
+    }
+    draft.updated_at = now;
+    write_asset_canvas_draft_locked(root, &draft)?;

@@ -0,0 +1637,4 @@
+
+fn classify_canvas_generation_error(error: &str) -> (bool, &'static str) {
+    if error.contains("authentication-required") {
+        return (false, "authentication-required");

@@ -0,0 +1063,4 @@
+      return;
+    }
+    const epoch = epochRef.current;
+    void host.project

@@ -0,0 +1794,4 @@
+                layer={layer}
+                selected={selected}
+                aria-label={`图层 ${layer.title}`}
+                onPointerDown={(event: ReactPointerEvent<HTMLElement>) => {

@@ -0,0 +838,4 @@
+        .resource_id
+        .as_deref()
+        .map(str::trim)
+        .filter(|value| {

@@ -0,0 +1569,4 @@
+            ledger.error_code.as_deref().unwrap_or("generation-failed"),
+        ));
+    }
+    let configuration_fingerprint = canvas_api_identity_fingerprint(api_base_url, api_mode);

@@ -0,0 +1695,4 @@
+            None,
+        );
+    }
+    if current_revision.revision != input.expected_project_revision {

@@ -0,0 +1153,4 @@
+      });
+  }, [exitActionPending, onCancel, persistDraft, stableScope.draftId]);
+
+  const requestCanvasExit = useCallback(() => {

@@ -0,0 +1935,4 @@
+                  className="asset-canvas-surface__layer-hit-target"
+                  aria-label={`选择图层 ${layer.title}`}
+                  aria-pressed={selected}
+                  onClick={(event) => {

@@ -0,0 +133,4 @@
+  color: var(--platform-button-primary-text);
+}
+
+.asset-canvas-surface[data-state='canvas.generating']

@@ -1089,0 +1388,4 @@
+      pendingResourceFocusRef.current = null;
+      setAssetCanvasRoute(null);
+      setAssetCanvasNotice('');
+      setResourceEditorRoute({

@@ -0,0 +1500,4 @@
+                return Ok(result);
+            }
+            Some("failed") => {
+                return Err("资源编辑生成失败".to_string());

@@ -0,0 +1944,4 @@
+    }
+    if let Some(existing) = manifest.assets.iter().find(|asset| asset.id == asset_id) {
+        ledger.result_asset_id = Some(existing.id.clone());
+        update_resource_edit_phase(root, ledger, ResourceEditLedgerPhase::Committed)?;

@@ -0,0 +459,4 @@
+        ) {
+          return;
+        }
+        draftRef.current = loaded.value;

@@ -1192,0 +1969,4 @@
+                      type="button"
+                      disabled={resumingResourceEditId !== null}
+                      onClick={() => {
+                        const pending = pendingResourceEdits[0];

@@ -0,0 +1575,4 @@
+    if ledger
+        .api_identity_fingerprint
+        .as_ref()
+        .is_some_and(|value| value != &configuration_fingerprint)

@@ -0,0 +1899,4 @@
+        <section
+          className="asset-canvas-surface__operation-overlay"
+          role="alert"
+          aria-label="图片生成失败"

@@ -0,0 +2024,4 @@
+                  onPointerDown={(event: ReactPointerEvent<HTMLButtonElement>) => {
+                    if (lifecycleRef.current.kind !== 'canvas.editing') return;
+                    event.stopPropagation();
+                    const targetIds = event.shiftKey

@@ -0,0 +2043,4 @@
+                      }
+                      return;
+                    }
+                    captureHistory({