refactor: restructure Go code into workspace with api, core, and adk modules

[EItanya]

Split the monolithic go/ module into a Go workspace with three modules:

• go/api: shared types (CRDs, ADK types, database models, HTTP client SDK)
• go/core: infrastructure (controllers, HTTP server, CLI, DB implementation)
• go/adk: Go Agent Development Kit (moved from contrib/go-adk/, types deduplicated)

Key changes:

• Unified Dockerfile parameterized with BUILD_PACKAGE for both controller and adk
• Unified go/Makefile with workspace-wide fmt/vet/lint/test targets
• ADK types deduplicated: canonical definitions in go/api/adk, re-exported in go/adk/pkg/config
• ExecuteCode/Stream fields changed from bool to *bool with helper methods
• Fix LLM Name() methods to return model name instead of provider name (fixes 404s)
• Add oneshot example tool for quick agent config testing
• Update CI workflows, root Makefile, documentation for new paths

[Copilot]

Pull request overview

This PR restructures the Go codebase from a monolithic module into a workspace with three distinct modules (api, core, adk), improving separation of concerns and enabling independent versioning. The refactoring deduplicates ADK types by establishing canonical definitions in go/api/adk, fixes critical LLM provider bugs where model Name() methods returned provider names instead of model names (causing 404 errors), and unifies the build system with a parameterized Dockerfile and workspace-wide Make targets.

Changes:

• Restructured Go code into workspace with api (shared types), core (infrastructure), and adk (agent SDK) modules
• Fixed LLM Name() methods to return model names instead of provider names (resolves API 404 errors)
• Changed AgentConfig ExecuteCode/Stream fields from bool to *bool with helper methods for backward compatibility

Reviewed changes

Copilot reviewed 136 out of 426 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
go/core/internal/controller/translator/agent/testdata/outputs/*.json	Updated golden test files to reflect ExecuteCode/Stream bool→*bool changes and removed null fields
go/core/internal/controller/translator/agent/testdata/README.md	Updated test commands to reflect new module paths (go/core/)
go/core/internal/controller/translator/agent/*.go	Updated import paths from go/internal to go/core/internal
go/core/internal/controller/*.go	Updated import paths for new module structure
go/core/internal/a2a/*.go	Updated import paths for core module
go/core/cli/internal/**/*.go	Updated CLI import paths for new workspace structure
go/core/go.mod	Changed module path from go to go/core and added go/api dependency
go/core/cmd/controller/main.go	Removed MCPServerPlugins field from plugin config
go/api/v1alpha2/agent_types.go	Added ImageRepository field to DeclarativeDeploymentSpec
go/api/v1alpha2/common_types.go	Updated import path from go/internal/utils to go/api/utils
go/api/utils/utils.go	New file: extracted shared utilities to api module
go/api/httpapi/types.go	Changed package name from api to httpapi and updated database import
go/api/go.mod	New module definition for shared api types
go/api/database/models.go	Updated import path for ADK types
go/api/client/*.go	Updated import paths from pkg/client/api to api/httpapi
go/api/adk/types.go	Added TLS config fields, Anthropic parameters, GenericModel type, and changed ExecuteCode/Stream to *bool with helper methods
go/adk/pkg/**/*.go	Updated import paths for adk module structure and Go 1.25 improvements (slices.Sort, maps.Copy)
go/adk/pkg/models/openai_adk.go	Fixed Name() to return m.Config.Model instead of "openai"
go/adk/pkg/models/anthropic_adk.go	Fixed Name() to return m.Config.Model instead of "anthropic"
go/adk/pkg/agent/agent.go	Moved MCP toolset creation into CreateGoogleADKAgent, removed toolsets parameter
go/adk/pkg/config/types.go	New file: re-exports types from go/api/adk for backward compatibility
go/adk/examples/oneshot/main.go	New tool for quick agent config testing
go/adk/go.mod	Changed module path to go/adk and added go/api dependency
go/README.md	Updated to document workspace structure and build commands
go/Makefile	Updated for workspace: fmt/vet/lint/test targets now iterate over modules
go/Dockerfile	Parameterized with BUILD_PACKAGE to support both controller and adk builds
go/.gitignore	Updated for new bin/ locations
contrib/go-adk/*	Removed duplicate ADK implementation (merged into go/adk)
Makefile	Updated paths, added golang-adk build target
.github/workflows/*.yaml	Updated paths and added golang-adk to build matrix

Comments suppressed due to low confidence (1)

go/core/cmd/controller/main.go:36

• Removed MCPServerPlugins: nil but AgentPlugins: nil remains. If both fields were always nil, consider whether the entire plugins configuration is needed or if the struct initialization can be simplified.

			AgentPlugins:  nil,

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