TrueGrowth/openspec/changes/add-video-prompt-pdf-context/tasks.md

1. Implementation

• 1.1 Extend popular-video source/task types to support prompt-based source records and prompt-generation tasks.
• 1.2 Add a video prompt-generation prompt builder that returns VideoAnalysisData JSON compatible with the existing workflow.
• 1.3 Add 提示词生成 input mode before 上传视频, with prompt text, optional PDF upload/removal, model selection, and queue submission.
• 1.4 Route prompt-generation tasks through the existing Gemini chat + PDF inline-data path and finalize structured results.
• 1.5 Sync completed prompt-generation tasks into AnalysisRecord history without storing PDF base64.
• 1.6 Add focused tests for prompt builder/parsing, task sync, and PDF task params.

2. Verification

• 2.1 Run targeted unit tests for video analyzer utilities/task sync.
• 2.2 Manually verify prompt-only generation, prompt + PDF generation, invalid PDF, oversized PDF, and history reopen behavior.