refactor(AI): remove addAi customization

[EnkiP]

Definition of Done

fixes PRD-805

General

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• Test manually the implemented changes
• Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

• Consider the security impact of the changes made

Note

Remove addAi customization and AI proxy routes from the agent

• Removes the addAi() method from Agent, eliminating AI provider registration, AI proxy route mounting, and ai_llms from generated schema metadata.
• Deletes AiProxyRoute and the createAiProvider factory from @forestadmin/ai-proxy, along with the AiProviderDefinition/AiRouter/AiProviderMeta interfaces from agent-toolkit.
• Behavioral Change: Any agent configured with addAi() will break; schema metadata no longer includes the ai_llms field sent to Forest Admin.

^{Macroscope summarized aa1720a.}

[linear-code]

PRD-805

[qltysh]

Coverage Impact

This PR will not change total coverage.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	packages/agent/src/agent.ts	100.0%
	Total	100.0%

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