Add pagination to prompt list contracts

[haasonsaas]

Summary

• add optional limit and offset to the four prompts.v1 list requests
• add total and has_more to the matching list responses
• regenerate Go, Python, and TypeScript bindings

Testing

• buf lint
• buf build
• go test ./... -count=1
• npm ci
• npm run check:package

[cursor]

PR Summary

Medium Risk
Updates protobuf API contracts for multiple list RPCs, which requires coordinated client/server rollout and may break consumers that assume non-paginated responses. Changes are additive but touch cross-language generated bindings.

Overview
Adds pagination to the prompts.v1 list RPC contracts by introducing limit/offset on ListPrompts, ListVersions, ListLabels, and ListDeployments requests, and total/has_more on the corresponding responses.

Regenerates Go, Python, and TypeScript protobuf bindings to expose the new fields (including new getters/typed properties and updated serialized descriptors).

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