fix(codec): align av1 codec parameters with specification

[SomeBody16]

COMPLETES SPARK-821152

This pull request addresses

The AV1 codec parameter presets in plugin-meetings used raw frame-size-derived maxPicSize values for each supported resolution.

Those values should reflect the AV1 spec level limits so the advertised codec parameters align with the selected AV1 levels and correctly cover the intended resolutions.

Spec reference: https://aomediacodec.github.io/av1-spec/av1-spec.pdf

by making the following changes

Updates AV1_CODEC_PARAMETERS in packages/@webex/plugin-meetings/src/multistream/codec/constants.ts so each supported resolution uses spec-aligned maxPicSize values:

• 90p and 180p: 147_456
• 360p: 278_784
• 540p: 665_856
• 720p: 1_065_024
• 1080p: 2_359_296

The existing levelIdx, dimensions, tier, and maxDecodeRate values are unchanged.

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

• Not run; no local branch test execution was provided or verified during this PR description refresh.
• Diff reviewed for the AV1 parameter updates in packages/@webex/plugin-meetings/src/multistream/codec/constants.ts.

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