fix(openapi): Fix all OpenAPI linting errors and add stricter validation rules

[vdusek]

Issue

• Relates Ensure OpenAPI specs can serve as a reliable source of truth for typed client generation #2182

Description

• Enable info-license: error
  • Add Apache 2.0 license to openapi.yaml
• Enable tag-description: error
  • Add descriptions to Storage and Webhooks tags
• Enable no-invalid-schema-examples: error
  • Fix all examples in schema/ dir
• Enable no-invalid-media-type-examples: error
  • Fix all examples in paths/ dir
• Enable operation-4xx-response: error
  • Add error response components based on the common ErrorResponse
• A few more minor fixes
  • finishedAt type is nullable
  • reference to CreateOrUpdateVersionRequest
  • ...

Tests

• CI passes

---

Note

Strengthens OpenAPI quality and consistency and resolves all lint errors.

• Stricter validation: Updates redocly.yaml to enforce info-license, tag-description, no-invalid-*-examples, and operation-4xx-response rules; adds Apache 2.0 license to openapi.yaml.
• Standardized errors: Introduces reusable 400 (BadRequest) plus Unauthorized and NotFound response components; wires 400 across numerous paths/* endpoints.
• Schema/example fixes: Corrects invalid examples and types (e.g., JSON strings, arrays vs objects, URLs without extra quotes), makes finishedAt nullable in Run, updates KeyValueStore/Webhook* examples, adjusts refs (e.g., CreateOrUpdateVersionRequest), and refines sample fields (e.g., pricing, computeUnits, generalAccess).
• Docs metadata: Adds tag descriptions (e.g., Storage, Webhooks) and minor descriptive cleanups.

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