Backend API Reliability — atomic locks, self-heal, hang-on-missing-file#146

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wowa1990 wants to merge 12 commits into

splitti:mainfrom

wowa1990:pr-backend-api-reliability

Commits on May 16, 2026

backend-api: stop /api/data, /api/mupihat, /api/wlan hanging without file; 500 instead of throw on /api/addwlan
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backend-api: fix resume lock race + use composite key for dedup
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backend-api: /api/activeresume returns [] when symlink missing
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backend-api: /api/resume returns [] when file missing instead of 404
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backend-api: fix lock race in /api/add /delete /edit (data.json)
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backend-api: self-heal corrupt or missing resume.json
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drop resume entry when library album finishes naturally
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fix(server): atomic lock acquisition + stale-lock recovery (AR5-6, M8)
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fix(server): reject addresume that arrives right after a deleteresume (AR5-18)
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robustness: backend Spotify request timeouts (B6)
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fix: resume page latency — skip RSS enrichment + HEAD-probe rssfeed
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fix: resume page sorts by last-played timestamp
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