feat: add batch parallel image generation and provider-level throttling

- Add --batchfile and --jobs flags for multi-image parallel generation
  with per-provider concurrency control and rate limiting
- Refactor main.ts into prepareSingleTask/prepareBatchTasks/runBatchTasks
  with worker pool pattern and up to 3 retries per image
- Fix Replicate provider: use image_input array (nano-banana-pro schema),
  add match_input_image aspect ratio, add quality-to-resolution mapping
- Improve OpenAI error message for missing API key (Codex auth hint)
- Expand non-retryable error detection (4xx codes, disabled models)
- Add batch config to EXTEND.md schema (max_workers, provider_limits)
- Add build-batch.ts for article-illustrator batch workflow integration
- Add image-language awareness pass to baoyu-translate

Co-authored-by: 敖氏 <aoshi@MacBook-Air.local>

skills/baoyu-image-gen/references/config/preferences-schema.md

@@ -21,9 +21,25 @@ default_image_size: null    # 1K|2K|4K|null (Google only, overrides quality)
 
 default_model:
   google: null              # e.g., "gemini-3-pro-image-preview", "gemini-3.1-flash-image-preview"
-  openai: null              # e.g., "gpt-image-1.5"
+  openai: null              # e.g., "gpt-image-1.5", "gpt-image-1"
   dashscope: null           # e.g., "z-image-turbo"
   replicate: null           # e.g., "google/nano-banana-pro"
+
+batch:
+  max_workers: 10
+  provider_limits:
+    replicate:
+      concurrency: 5
+      start_interval_ms: 700
+    google:
+      concurrency: 3
+      start_interval_ms: 1100
+    openai:
+      concurrency: 3
+      start_interval_ms: 1100
+    dashscope:
+      concurrency: 3
+      start_interval_ms: 1100
 ---
 ```
 
@@ -40,6 +56,9 @@ default_model:
 | `default_model.openai` | string\|null | null | OpenAI default model |
 | `default_model.dashscope` | string\|null | null | DashScope default model |
 | `default_model.replicate` | string\|null | null | Replicate default model |
+| `batch.max_workers` | int\|null | 10 | Batch worker cap |
+| `batch.provider_limits.<provider>.concurrency` | int\|null | provider default | Max simultaneous requests per provider |
+| `batch.provider_limits.<provider>.start_interval_ms` | int\|null | provider default | Minimum gap between request starts per provider |
 
 ## Examples
 
@@ -65,5 +84,11 @@ default_model:
   openai: "gpt-image-1.5"
   dashscope: "z-image-turbo"
   replicate: "google/nano-banana-pro"
+batch:
+  max_workers: 10
+  provider_limits:
+    replicate:
+      concurrency: 5
+      start_interval_ms: 700
 ---
 ```