Multi-stream follow-up: simplify UI and fix lifecycle bugs

[BlueCheeseburger]

Follow-up to the merged multi-stream feature (#1). Contains UI cleanup and bug fixes found during testing.

UI simplification

• Removed YouTube from the multi-stream section (it's the primary service — having it again was confusing)
• Removed the server URL fields; defaults are hardcoded and correct for nearly all users
• Added a description label explaining these are additional simultaneous destinations
• Renamed the group to "Also Stream To"

Lifecycle bug fixes (found in bug testing)

• Orphaned streams on disconnect (critical): StreamingStop() — the signal callback fired when the primary output stops for any reason — now tears down the secondary streams. Previously only the manual stop path did, so a primary disconnect/error left Twitch/TikTok broadcasting and could crash on a later ResetOutputs() via dangling encoder references.
• Double-start orphan: Start() now defensively stops existing outputs first, avoiding orphaning a running output on the reconnect re-entry path.
• Shutdown ordering: secondary outputs are force-stopped and released (destructor + explicit reset) before obs_shutdown(), since they share the primary handler's encoders.

Verified correct (not bugs)

• Encoder sharing across outputs (OBS supports N outputs per encoder)
• Ref-counting / ownership (operator= takes ownership; no leaks or double-frees)
• Config persistence, API-triggered streaming routing
• clang-format clean, CMake alphabetized, .ui valid XML

Test plan

• Settings → Stream shows "Also Stream To" with Twitch/TikTok (no YouTube, no server fields)
• Enable Twitch + TikTok with valid keys, start streaming — all three destinations receive video
• Pull the network on the primary — confirm secondary streams stop (not orphaned)
• Stop streaming normally — all outputs stop cleanly
• Close OBS while multi-streaming — no crash on shutdown

https://claude.ai/code/session_01L3WhNDVEXb2TatcruuniCp

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