recorder: index sync + VP8 disable

[4627488]

Summary

• liveion: add index.json persistence for recorder sessions (index_path config; start/stop updates)
• liveion: add pull/ack APIs for recorder index sync
• liveman: add record_sync loop to pull index and ack after DB upsert
• SDP: add configurable VP8 disable filter for WHIP/WHEP
• update example configs (live777.toml, liveman.toml)

[codecov]

Codecov Report

❌ Patch coverage is 9.34579% with 194 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
liveman/src/tick.rs	0.00%	115 Missing ⚠️
liveion/src/route/sdp.rs	7.69%	48 Missing ⚠️
liveman/src/config.rs	0.00%	13 Missing ⚠️
liveion/src/route/recorder.rs	37.50%	10 Missing ⚠️
liveman/src/route/recorder.rs	0.00%	6 Missing ⚠️
liveman/src/lib.rs	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
libs/api/src/path.rs	84.61% <100.00%> (+2.79%)	⬆️
libs/api/src/recorder.rs	0.00% <ø> (ø)
liveion/src/config.rs	75.00% <ø> (ø)
liveion/src/route/whep.rs	76.19% <100.00%> (+0.58%)	⬆️
liveion/src/route/whip.rs	90.00% <100.00%> (+0.34%)	⬆️
liveman/src/utils.rs	0.00% <ø> (ø)
liveman/src/lib.rs	0.00% <0.00%> (ø)
liveman/src/route/recorder.rs	0.00% <0.00%> (ø)
liveion/src/route/recorder.rs	22.22% <37.50%> (+0.48%)	⬆️
liveman/src/config.rs	0.00% <0.00%> (ø)
... and 2 more

... and 1 file with indirect coverage changes

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