Delegate series metadata to external addons for episode selection

[leo-mathurin]

Summary

• Restrict Stremlist's metadata resource to movies while preserving series catalogs.
• Return { meta: null } for series metadata requests so clients fall back to other addons.
• Add regression coverage for manifests, cached series catalogs, and series fallback behavior.

The screenshots compare production with the local candidate in Stremio, with Stremlist first in addon order. Series details require another metadata provider. Playback was not tested.

Before (Stremio episode selection)	After (Stremio episode selection)

Testing

• pnpm --filter @stremlist/backend test
• pnpm --filter @stremlist/backend build
• pnpm --filter @stremlist/backend typecheck
• pnpm --filter @stremlist/backend lint
• git diff --check
• Manual Stremio and Nuvio validation confirmed episode selection with Stremlist ordered before other metadata providers.

[vercel]

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2 Skipped Deployments

Project	Deployment	Actions	Updated
stremlist-backend	Ignored	Preview	Sep 14, 2026 8:47pm UTC
stremlist-frontend	Ignored	Preview	Sep 14, 2026 8:47pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with the series delegation behavior consistently applied and covered by regression tests.

Summary

This PR delegates series metadata resolution to external addons while retaining Stremlist's cached movie metadata and series catalogs.

• Narrows the advertised metadata resource to movies.
• Returns null immediately for series metadata requests, including requests based on stale manifests.
• Adds regression tests covering manifests, cached series catalogs, and metadata fallback.
• Adds a reproducible QA bridge and client-validation documentation.
• Synchronizes the addon and package versions at 1.9.0.

_{Reviews (1) · Last reviewed commit: "fix(metadata): delegate series metadata ..."}