Implement Morph, StepFun, and Inception AI adapters

[Echolonius]

Summary

• Replaces the placeholder stubs for packages/ai/morph, packages/ai/stepfun, and packages/ai/inception with real implementations
• All three follow the OpenAI-compatible chat-completions pattern already used by groq: defineAi config with a baseUrl override, redacted error messages on non-2xx responses, and usage token mapping to inputTokens/outputTokens
• Base URLs and request/response shapes verified live against each provider before implementing (unauthenticated POST to /v1/chat/completions returns the expected OpenAI-style auth/validation error, confirming host + path):
  • Morph: https://api.morphllm.com/v1/chat/completions, model morph-v2
  • StepFun: https://api.stepfun.com/v1/chat/completions, model step-2-16k
  • Inception: https://api.inceptionlabs.ai/v1/chat/completions, model mercury

Test plan

• Added unit tests for all three adapters mirroring packages/ai/groq/src/index.test.ts (dry-run short-circuit, request shape, base URL override, error redaction, missing-key throw)
• CI: pnpm --filter @profullstack/sh1pt-ai-morph --filter @profullstack/sh1pt-ai-stepfun --filter @profullstack/sh1pt-ai-inception typecheck && pnpm vitest run packages/ai/morph/src/index.test.ts packages/ai/stepfun/src/index.test.ts packages/ai/inception/src/index.test.ts

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🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.