feat: 完成短剧项目空间与结构化资产创作闭环 (#38)

* feat(canvas): 短剧项目空间 - 建立项目章节与画布关联 MVP

* feat(canvas): 短剧项目空间 - 完善项目资产、镜头与流程闭环

Refs #30

* fix(deploy): 本地部署 - 修复前端构建并忽略本地 PostgreSQL 配置

* feat(*): 短剧项目空间 - 完成项目、章节、资产、角色与画布创作闭环

Refs #30

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Co-authored-by: ddCat <ddcat666@88.com>

web/src/lib/canvas/canvas-context-summary.ts

@@ -0,0 +1,30 @@
+import type { ProjectUnit } from "@/services/api/projects";
+import type { CanvasNodeData } from "@/types/canvas";
+
+export type CanvasContextSummary = {
+    nodeCount: number;
+    selectedCount: number;
+    chapterLabel: string;
+    shotLabel: string;
+};
+
+export function summarizeCanvasContext(nodes: CanvasNodeData[], selectedNodeIds: Set<string>, units: ProjectUnit[] = []): CanvasContextSummary {
+    const selectedNodes = nodes.filter((node) => selectedNodeIds.has(node.id));
+    const unitTitleById = new Map(units.map((unit) => [unit.id, unit.title]));
+    const chapterTitles = unique(selectedNodes.flatMap((node) => {
+        const chapterTitle = node.metadata?.chapterTitle || (node.metadata?.chapterId ? unitTitleById.get(node.metadata.chapterId) : "");
+        return chapterTitle ? [chapterTitle] : [];
+    }));
+    const shotIndexes = unique(selectedNodes.flatMap((node) => typeof node.metadata?.shotIndex === "number" ? [node.metadata.shotIndex] : []));
+
+    return {
+        nodeCount: nodes.length,
+        selectedCount: selectedNodes.length,
+        chapterLabel: chapterTitles.length === 1 ? chapterTitles[0] : chapterTitles.length > 1 ? `${chapterTitles.length} 个章节` : "",
+        shotLabel: shotIndexes.length === 1 ? `镜头 ${shotIndexes[0] + 1}` : shotIndexes.length > 1 ? `${shotIndexes.length} 个镜头` : "",
+    };
+}
+
+function unique<T>(values: T[]) {
+    return Array.from(new Set(values));
+}