合并豆包万相图片技能到image-tools，删除doubao-image独立目录

.trae/skills/image-tools/references/doubao-api-reference.md

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+# Volcengine Ark Image API Reference
+
+## Endpoint
+
+`POST https://ark.cn-beijing.volces.com/api/v3/images/generations`
+
+## Authentication
+
+```
+Authorization: Bearer ark-119a37ed-f123-42fc-aea6-b38d47d47fc0-f7ddf
+```
+
+## Response Format
+
+### Success Response (response_format: "url")
+
+```json
+{
+  "created": 1234567890,
+  "data": [
+    {
+      "url": "https://...",
+      "revision": 0
+    }
+  ]
+}
+```
+
+### Success Response (response_format: "b64_json")
+
+```json
+{
+  "created": 1234567890,
+  "data": [
+    {
+      "b64_json": "...",
+      "revision": 0
+    }
+  ]
+}
+```
+
+### Error Response
+
+```json
+{
+  "error": {
+    "code": "invalid_request_error",
+    "message": "..."
+  }
+}
+```
+
+## Available Models
+
+| Model ID | Capabilities | Max Size |
+|---|---|---|
+| `doubao-seedream-5-0-260128` | Text-to-image, image-to-image, multi-image fusion, editing, batch | 2K |
+| `doubao-seedream-4-5-t2i` | Text-to-image, image-to-image, multi-image fusion | 4K |
+| `doubao-seedream-4-0-t2i` | Text-to-image, image-to-image, multi-image fusion | 4K |
+| `doubao-seedream-5-0-lite-t2i` | Text-to-image, batch, web search | 3K |
+| `doubao-seedream-3-0-t2i` | Text-to-image (with seed/guidance_scale) | 2K |
+| `doubao-seededit-3-0-i2i` | Dedicated image editing (with seed/guidance_scale) | adaptive |
+
+## Image Input Formats
+
+- **URL**: Publicly accessible HTTP/HTTPS URL
+- **Base64**: `data:image/<format>;base64,<encoded_data>`
+  - Format must be lowercase: `data:image/png;base64,...` (not `PNG`)
+  - Supported formats: png, jpeg, webp
+
+## Size Constraints
+
+- Pixel range: `[1280, 4096]` for both width and height
+- Max aspect ratio: 3:1 (long edge to short edge)
+- Custom size format: `"WIDTHxHEIGHT"` (e.g., `"2048x1024"`)