recorders: add granular codec / container / port columns

Expands recorders with video bitrate, framerate, audio codec / bitrate
/ channels, container format, and a node_id/device_index pair so the UI
can pin SDI recorders to a specific node + DeckLink port instead of
relying on a flat "BM1/BM2" index. capture-manager.js consumes these via
env vars and builds ffmpeg args from them.

services/mam-api/src/db/migrations/008-codec-settings.sql

@@ -0,0 +1,26 @@
+-- 008 — Extended codec controls for recorders.
+--
+-- Adds video bitrate, framerate, audio codec / bitrate / channels, and
+-- container format columns to recorders so the UI can offer granular
+-- control instead of the four-options dropdown. capture-manager.js reads
+-- these via env vars and builds ffmpeg args from them.
+
+ALTER TABLE recorders
+  ADD COLUMN IF NOT EXISTS recording_video_bitrate  TEXT,
+  ADD COLUMN IF NOT EXISTS recording_framerate      TEXT,
+  ADD COLUMN IF NOT EXISTS recording_audio_codec    TEXT DEFAULT 'pcm_s24le',
+  ADD COLUMN IF NOT EXISTS recording_audio_bitrate  TEXT,
+  ADD COLUMN IF NOT EXISTS recording_audio_channels INTEGER DEFAULT 2,
+  ADD COLUMN IF NOT EXISTS recording_container      TEXT DEFAULT 'mov',
+  ADD COLUMN IF NOT EXISTS proxy_video_bitrate      TEXT DEFAULT '8M',
+  ADD COLUMN IF NOT EXISTS proxy_framerate          TEXT,
+  ADD COLUMN IF NOT EXISTS proxy_audio_codec        TEXT DEFAULT 'aac',
+  ADD COLUMN IF NOT EXISTS proxy_audio_bitrate      TEXT DEFAULT '192k',
+  ADD COLUMN IF NOT EXISTS proxy_audio_channels     INTEGER DEFAULT 2,
+  ADD COLUMN IF NOT EXISTS proxy_container          TEXT DEFAULT 'mp4',
+  ADD COLUMN IF NOT EXISTS node_id                  UUID,
+  ADD COLUMN IF NOT EXISTS device_index             INTEGER;
+
+-- node_id is the cluster_nodes.id the recorder is pinned to (for SDI
+-- recorders this is the node hosting the DeckLink card). device_index is
+-- the DeckLink port index on that node.