Add gRPC connection factory with load balancing

[molon]

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[Copilot]

Pull Request Overview

This PR implements a comprehensive migration from kit logging to standard Go slog, introduces gRPC utilities for connection management with load balancing, and refactors test data protobuf definitions to use versioned packages.

• Migrates from github.com/theplant/appkit/log to Go's standard log/slog throughout the codebase
• Adds new gRPC utilities for server setup, client connections with load balancing support, and logging interceptors
• Introduces versioned protobuf test data with proper package organization
• Updates error notification system to use slog and removes logger dependencies

Reviewed Changes

Copilot reviewed 26 out of 27 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
statusx/vproto.go	Migrates from kit logging to slog for error handling
statusx/validate_test.go	Updates test imports to use versioned testdata package
statusx/testdata/proto/testdata/v1/input.proto	Restructures proto package to versioned format
statusx/http.go	Replaces kit logging with slog for HTTP error writing
statusx/gen/testdata/v1/input.pb.validate.go	Generated code for versioned proto validation
statusx/gen/testdata/v1/input.pb.go	Generated code for versioned proto definitions
statusx/buf.yaml	Adds testdata/proto to buf configuration
statusx/buf.gen.yaml	Includes testdata/proto in generation inputs
slogx/slog.go	New package providing structured logging configuration
normalize/grpc.go	Migrates gRPC normalization from kit logging to slog
netx/dial.go	New package for network listener factory utilities
httpx/server.go	Refactors HTTP server setup with slog and netx integration
healthz/grpc_test.go	Updates test parameter type from interface{} to any
grpcx/server.go	New gRPC server factory with lifecycle management
grpcx/logging.go	New gRPC logging interceptors using slog
grpcx/logger.go	Removes old kit logging-based gRPC logger
grpcx/conn.go	New gRPC connection factory with load balancing support
grpcx/config.go	Configuration struct for gRPC server setup
grpcx/bufconn.go	Utilities for in-memory gRPC connections for testing
gormx/tracing.go	Makes logger injection optional for GORM tracing
gormx/database.go	Migrates database setup from kit logging to slog
go.mod	Updates inject dependency and adds OpenTelemetry trace dependency
errornotifierx/slog.go	New slog-based error notifier implementation
errornotifierx/errornotifier.go	Refactors error notification to remove logger dependency
errornotifierx/config_test.go	Updates tests to remove logger requirements
errornotifierx/airbrake.go	Simplifies Airbrake notifier interface

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