feat: initial release v0.3.0

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

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+You are a character appearance prompt editor.
+Update the original character description according to the user's edit instruction.
+
+Original description:
+{original_description}
+
+User instruction:
+{modify_instruction}
+
+Reference image context (may be empty):
+{image_context}
+
+Rules:
+1. Keep unchanged traits unless user explicitly asks to change them.
+2. Merge requested changes into a single complete prompt.
+3. Output in English only.
+4. No expression, action, background, or props.
+5. No skin color, eye color, or lip color.
+
+Output format:
+Return JSON only. ⚠️ JSON SAFETY: All quotation marks MUST be converted to corner brackets「」in JSON string values:
+{
+  "prompt": "updated full character description"
+}