feat!: Add optional OTEL LLM instrumentation to provider packages

[jsonbailey]

Note

Medium Risk
Touches provider initialization/invocation paths and adds dynamic optional instrumentation plus always-on telemetry for Vercel, which can affect runtime behavior and performance; dependency/peer range changes (notably openai and ai major versions) may introduce integration friction.

Overview
Adds automatic OpenTelemetry tracing support across the server-side AI provider packages.

server-ai-openai and server-ai-langchain now attempt a one-time, best-effort ESM patch on first provider create() via @traceloop/instrumentation-*’s manuallyInstrument() (falling back silently with a debug log if the optional packages aren’t installed), and both packages document how to enable this.

server-ai-vercel now always enables the Vercel AI SDK’s built-in telemetry by passing experimental_telemetry: { isEnabled: true } on each request; tests and README are updated accordingly, and peer dependency ranges are widened (notably ai up to v6 and @ai-sdk/* up to v3). Dependency metadata is updated to mark the OTEL packages as optional peers, and server-ai-openai tightens its openai peer range to <6 (and aligns devDependency to ^5).

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[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 25462 bytes
Compressed size limit: 26000
Uncompressed size: 124854 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 23696 bytes
Compressed size limit: 25000
Uncompressed size: 82252 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 171507 bytes
Compressed size limit: 200000
Uncompressed size: 799367 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 19742 bytes
Compressed size limit: 20000
Uncompressed size: 103795 bytes

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Cursor Bugbot has reviewed your changes and found 1 potential issue.