feat(connectrpc): integrate connect-go HealthService as PoC

[appleboy]

Summary

• Add connect-go HealthService with a Check RPC as a proof-of-concept for integrating connect-go alongside Gin
• Create composite HTTP handler using http.ServeMux for path-prefix routing so both connect-go and Gin share the same port
• Add buf v2 configuration (buf.yaml, buf.gen.yaml) and Makefile targets (proto, proto-lint) for protobuf codegen

Test plan

• New unit test for HealthServer.Check passes
• Full test suite passes (go test ./...)
• Lint passes (make lint)
• Manual: curl -X POST http://localhost:8080/health.v1.HealthService/Check -H "Content-Type: application/json" -d '{}' returns SERVING_STATUS_SERVING
• Manual: curl http://localhost:8080/health still returns {"status":"healthy","database":"connected"}

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Introduces a proof-of-concept ConnectRPC (connect-go) unary HealthService alongside the existing Gin HTTP server by composing handlers under a single port, and adds Buf v2 configuration/targets for protobuf code generation.

Changes:

• Add health.v1.HealthService protobuf definition and generated Go/connect stubs.
• Add internal/connectrpc HealthServer implementation + unit test.
• Route ConnectRPC services via an http.ServeMux composite handler while keeping Gin as the fallback, and add Buf v2 + Makefile targets for proto generation/linting.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
proto/health/v1/health.proto	Defines the new health.v1 service/messages used for ConnectRPC PoC.
internal/gen/health/v1/health.pb.go	Generated protobuf Go types for the health API.
internal/gen/health/v1/healthv1connect/health.connect.go	Generated connect-go client/handler scaffolding.
internal/connectrpc/health.go	Implements the ConnectRPC HealthService backed by store.Store.
internal/connectrpc/health_test.go	Adds a unit test for the ConnectRPC Check RPC.
internal/bootstrap/server.go	Adds a composite handler that routes ConnectRPC paths and falls back to Gin.
internal/bootstrap/bootstrap.go	Switches server wiring to use the composite handler.
buf.yaml	Adds Buf v2 module/lint/breaking configuration.
buf.gen.yaml	Configures Buf remote plugins for Go + connect-go generation into internal/gen.
Makefile	Adds proto/proto-lint targets and runs proto generation as part of make generate.
go.mod	Adds connectrpc.com/connect and promotes protobuf to a direct dependency.
go.sum	Adds module sums for connectrpc.com/connect.

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