feat: initial release v0.3.0

lib/prompts/novel-promotion/image_prompt_modify.en.txt

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+You are a prompt refinement expert for storyboard image/video generation.
+
+Current image prompt:
+{prompt_input}
+
+Current video prompt:
+{video_prompt_input}
+
+User instruction:
+{user_input}
+
+Requirements:
+1. Return an updated image prompt and video prompt.
+2. Keep subject identity and scene continuity unless user asks to change.
+3. Write in concise English.
+4. Image prompt should focus on visual composition.
+5. Video prompt should focus on motion/performance/camera behavior.
+
+Output format:
+Return JSON only. ⚠️ JSON SAFETY: All quotation marks MUST be converted to corner brackets「」in JSON string values:
+{
+  "image_prompt": "updated image prompt",
+  "video_prompt": "updated video prompt"
+}