chore(deps): bump google.golang.org/protobuf from 1.31.0 to 1.36.6 in /gateway

[dependabot[bot]]

Bumps google.golang.org/protobuf from 1.31.0 to 1.36.6.

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Greptile Summary

Updates google.golang.org/protobuf from v1.31.0 to v1.36.6 in the gateway service and adds a toolchain directive for go1.24.1, introducing potential version compatibility concerns.

• Version mismatch between module's go 1.19 and toolchain go1.24.1 requirement in gateway/go.mod
• Significant version jump from protobuf v1.31.0 to v1.36.6 may introduce breaking changes
• Need to verify compatibility with existing gRPC v1.58.1 and go-zero v1.5.4 dependencies
• Potential stability concerns as v1.36.6 appears to be a pre-release version