docs: update repository boundaries and Agent Canvas architecture

[DevinVinson]

Summary

• update product and repository ownership boundaries after the repository migration
• add a canonical Agent Canvas architecture page and clarify Agent Server, Automation Server, managed Cloud/Enterprise control-plane, and community Sandbox Server boundaries
• add generic Remote Backend documentation, reorganize Agent Canvas navigation, and move Modal under self-hosted backend services
• correct Docker/Helm UI paths and reassign the V1 API documentation to Sandbox Server
• exclude obsolete monorepo architecture pages from generated LLM context

Review status

This is a first pass over the broad scope in #686. It still needs a full human review, preferably page by page, for product language, information architecture, technical accuracy, and the remaining decisions listed in the issue. Please keep this PR in draft until that review is complete.

The latest pass clarifies that Sandbox Server is community-driven and not a core or supported Agent Canvas backend. It also distinguishes a generic remote Agent Server from the managed Cloud and Enterprise platforms, whose control planes create the sandboxes that host Agent Server.

Validation

• local Mintlify preview renders the revised architecture page and navigation
• 31 affected tests pass
• docs.json parses successfully
• git diff --check passes
• regenerated llms.txt and llms-full.txt omit the obsolete backend/runtime architecture pages

Known unrelated issue

The complete pricing test suite has two pre-existing errors because it fetches the removed OpenHands/OpenHands/main/openhands/utils/llm.py path. That separate pricing-source migration is not included here.

Closes #686

This draft pull request was created by an AI agent (OpenHands) on behalf of the user.

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