Summary

• Archive Feature: Automatically archive ended series based on TMDB status, with collapsible UI section for archived items
• Episode Offset: Auto-detect and apply episode offset for shows using absolute numbering (e.g., S02E18 → S02E05)
• TMDB Integration: Extract series status and season episode counts for both features

Changes

Backend

• Add archived field to Bangumi model with database migration (v4)
• Add archive/unarchive/suggest-offset/refresh-metadata API endpoints
• Enhance TMDB parser to extract series_status and season_episode_counts
• Integrate offset application in renamer's gen_path() method

Frontend

• Add collapsible archived section in bangumi page
• Add archive/unarchive button in edit rule popup
• Add offset field with "Auto Detect" button in rule editor
• Add i18n translations (zh-CN, en)

Test plan

• Verify database migration adds archived column: sqlite3 data/data.db ".schema bangumi"
• Test PATCH /api/v1/bangumi/archive/{id} and PATCH /api/v1/bangumi/unarchive/{id}
• Test GET /api/v1/bangumi/refresh/metadata auto-archives ended series
• Test GET /api/v1/bangumi/suggest-offset/{id} returns correct offset
• Verify offset is applied during file renaming (e.g., E18 with offset=-13 → E05)
• Verify archived section appears and is collapsible in UI
• Test auto-detect button fetches and applies suggested offset

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