fix: Reduce dependencies and use peer dependencies when needed

[jsonbailey]

Note

Moves provider runtime deps to peerDependencies with updated ranges, updates imports to use server AI SDK types, bumps @launchdarkly/server-sdk-ai to 0.12.2, and re-exports LDLogger.

• Dependencies/peerDependencies:
  • @launchdarkly/server-sdk-ai bumped to ^0.12.2 across providers; SDK version to 0.12.2.
  • Move provider libs to peer deps with updated ranges:
    • server-ai-langchain: peers @langchain/core ^0.2 || ^0.3, langchain ^0.2 || ^0.3.
    • server-ai-openai: peers openai >=4 <7.
    • server-ai-vercel: peers @ai-sdk/* ^2.0.0, ai ^4 || ^5 with optional peer meta; move @ai-sdk/provider and ai to dev deps.
• Code refactor (providers):
  • Import AIProvider from @launchdarkly/server-sdk-ai and use typed LDLogger from the same package in LangChainProvider, OpenAIProvider, and VercelProvider.
• SDK:
  • Re-export LDLogger from @launchdarkly/js-server-sdk-common in src/index.ts.

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[github-actions]

@launchdarkly/js-client-sdk-common size report
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Uncompressed size: 90259 bytes