Standardize source credential binding API

[RhysSullivan]

Summary

• Add the core credential binding HTTP/API and shared React surfaces for listing, setting, and removing source credential bindings.
• Move GraphQL, OpenAPI, MCP, and cloud generated-client consumers onto the core credentialBindings facade.
• Remove plugin-specific binding endpoints, SDK methods, binding schemas/exports, React atoms, compatibility adapters, and the OpenAPI-only credential-status helper.
• Standardize binding refs on slotKey while keeping plugin source configuration slots local to each plugin.

Validation

• bun run lint
• bun run typecheck
• bun run test -- src/credential-bindings.test.ts in packages/core/api
• bun run test -- src/plugins/credential-bindings.test.ts src/plugins/source-credential-status.test.ts in packages/react
• bun run test -- src/sdk/plugin.test.ts in packages/plugins/graphql
• bun run test -- src/sdk/plugin.test.ts src/api/handlers.test.ts in packages/plugins/mcp
• bun run test -- src/sdk/plugin.test.ts src/sdk/multi-scope-bearer.test.ts src/sdk/multi-scope-oauth.test.ts src/sdk/client-credentials-oauth.test.ts src/sdk/oauth-refresh.test.ts src/sdk/usage-scope-isolation.test.ts in packages/plugins/openapi
• bun run test:node -- src/services/sources-api.node.test.ts src/services/tenant-isolation.node.test.ts in apps/cloud

Stack

1. Standardize source credential binding API #810 👈 current
2. Share HTTP credential handling for source plugins #813
3. Refactor HTTP credential UI composition #815

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