feat(platform): 创作能力整合 - 新增 Gemini Images 图片请求协议

web/src/lib/gemini-image.ts

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+export type GeminiImageGenerationConfig = {
+    responseModalities: ["TEXT", "IMAGE"];
+    imageConfig?: { aspectRatio?: string; imageSize?: "1K" | "2K" | "4K" };
+};
+
+export type GeminiInlineImage = {
+    mimeType: string;
+    data: string;
+};
+
+const GEMINI_IMAGE_SIZES: Record<string, GeminiInlineImageGenerationSize> = {
+    low: "1K",
+    medium: "2K",
+    high: "4K",
+    "1k": "1K",
+    "2k": "2K",
+    "4k": "4K",
+};
+
+type GeminiInlineImageGenerationSize = "1K" | "2K" | "4K";
+
+export function parseGeminiImageDataUrl(dataUrl: string): GeminiInlineImage {
+    const match = dataUrl.trim().match(/^data:([^;,\s]+)(?:;[^,]*)?;base64,([A-Za-z0-9+/=_-]+)$/i);
+    if (!match) throw new Error("参考图片读取失败：未得到有效的 image data URL");
+    const mimeType = match[1].toLowerCase();
+    const data = match[2].replace(/-/g, "+").replace(/_/g, "/");
+    if (!mimeType.startsWith("image/")) throw new Error(`参考图片 MIME 类型无效：${mimeType}`);
+    if (!data) throw new Error("参考图片读取失败：图片数据为空");
+    return { mimeType, data };
+}
+
+export function buildGeminiImageGenerationConfig(size?: string, quality?: string): GeminiImageGenerationConfig {
+    const imageConfig: NonNullable<GeminiImageGenerationConfig["imageConfig"]> = {};
+    const normalizedSize = size?.trim();
+    const normalizedQuality = quality?.trim().toLowerCase();
+    if (normalizedSize && normalizedSize !== "auto" && /^\d+:\d+$/.test(normalizedSize)) imageConfig.aspectRatio = normalizedSize;
+    const imageSize = GEMINI_IMAGE_SIZES[normalizedQuality || ""];
+    if (imageSize) imageConfig.imageSize = imageSize;
+    return { responseModalities: ["TEXT", "IMAGE"], ...(Object.keys(imageConfig).length ? { imageConfig } : {}) };
+}