feat: inject bundled mpv plugin for managed launches, remove legacy glob

- SubMiner-managed launcher and Windows shortcut launches inject the bundled plugin when no global plugin is detected
- First-run setup detects and removes legacy global plugin files via OS trash before managed playback starts
- Makefile `install-plugin` target and Windows config-rewrite script removed; Linux/macOS install now copies plugin to app data dir
- AniList stats search and post-watch tracking now go through the shared rate limiter
- Stats cover-art lookup reuses cached AniList data before issuing a new request
- Closing mpv in a launcher-managed session now terminates the background Electron app

backlog/completed/task-352 - Inject-bundled-mpv-plugin-for-managed-launches.md

@@ -0,0 +1,39 @@
+---
+id: TASK-352
+title: Inject bundled mpv plugin for managed launches
+status: Done
+assignee: []
+created_date: '2026-05-12 20:06'
+updated_date: '2026-05-12 20:15'
+labels:
+  - launcher
+  - mpv-plugin
+  - windows
+  - setup
+dependencies: []
+references:
+  - app-managed-mpv-runtime-plugin-plan.md
+priority: high
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Implement app-managed mpv runtime plugin loading so SubMiner-managed launcher and Windows mpv shortcut launches do not require a globally installed mpv plugin, while installed legacy/global plugins are detected and take precedence until removed.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Launcher-managed mpv launch injects the bundled plugin when no installed SubMiner mpv plugin is detected.
+- [x] #2 Launcher idle/Jellyfin mpv launch follows the same bundled-vs-installed plugin policy.
+- [x] #3 Windows SubMiner mpv shortcut launch skips bundled injection when an installed plugin is detected and injects bundled plugin otherwise.
+- [x] #4 First-run setup no longer requires global mpv plugin installation to finish; plugin install remains optional compatibility action.
+- [x] #5 Runtime plugin path resolution is test-covered and reports a clear failure when no bundled plugin path is available and no installed plugin exists.
+- [x] #6 Release docs/changelog explain that managed launches no longer require global plugin installation and legacy plugin removal switches to bundled runtime loading.
+<!-- AC:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Implemented app-managed mpv runtime plugin policy. Launcher-managed playback and idle/Jellyfin mpv startup now inject the bundled plugin when no global SubMiner plugin is detected, and keep using/logging the installed plugin when one is present. Windows SubMiner mpv shortcut launches use the same installed-vs-bundled policy while still passing SubMiner script opts. First-run setup no longer requires global plugin installation to finish, keeps legacy install as optional compatibility, and documents/removes legacy global plugin files via OS trash.
+<!-- SECTION:FINAL_SUMMARY:END -->