Remove deprecated v1 agent endpoints

[mintlify]

Summary

Removes the 3 deprecated v1 agent API endpoints (create agent job, get agent job, list agent jobs) that have been superseded by v2.

Changes

• Removed 12 deprecated MDX documentation pages (3 endpoints × 4 languages)
• Removed deprecated v1 paths from all 4 admin-openapi.json files (EN, FR, ES, ZH)
• Removed deprecated entries from docs.json navigation in all 4 language sections
• Updated all internal links (across 12 files) that referenced deprecated endpoints to point to v2 equivalents

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Note

Low Risk
Low risk because this PR only updates documentation and OpenAPI specs, but it may break external bookmarks or internal links if any v1 routes/pages were still being referenced.

Overview
Removes the deprecated v1 Agent API surface from the docs. The v1 create/get/list agent job OpenAPI paths and their MDX reference pages are deleted across EN/ES/FR/ZH.

Documentation and navigation are updated to reference only the v2 endpoints, including replacing v1 links in agent/use-cases.mdx, ai-native.mdx, and api/introduction.mdx, and pruning v1 entries from docs.json.

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