feat(storage): migration 0009 — meetings.audio_layout column (FR-SPK/FR-CAP)

src-tauri/migrations/0009_audio_layout.sql

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+-- WhispAssist dual-channel capture (FR-SPK/FR-CAP). Forward-only migration.
+-- Mirrors docs/03-data-model.md.
+PRAGMA foreign_keys = ON;
+
+-- How audio.wav stores its channels:
+--   NULL / 'summed' — mic summed into every loopback channel (all pre-2026-07-14
+--                     recordings and every import): one mixed mono-equivalent.
+--   'split'         — stereo, left = microphone ("You"), right = system/loopback
+--                     ("Speaker"), kept separate so diarization runs on the far
+--                     side alone. New mic-enabled recordings.
+-- Diarization, playback (downmix), and bundle export branch on this.
+ALTER TABLE meetings ADD COLUMN audio_layout TEXT;