refactor: remove unreachable runner code (#1179)

Remove inherited act APIs, configuration branches, and test seams that neither the daemon nor exec can reach. Constant-fold settings both entry points already enforce and consolidate duplicate runner paths.

Major removals:

- Unwired custom action-cache and local-repository-cache implementations.
- Legacy matrix, platform, input, container-reuse, logging, Git remote, and action-replacement configuration paths.
- Unused Docker socket, container network, tar-copy, and platform PTY wrappers.
- Single-implementation filesystem, environment, runner, and expression abstractions.
- Duplicated step-container, command-logging, credential, reusable-workflow, and execution paths.
- Generated client mock boilerplate, obsolete fixtures, test-only seams, stale wrappers, and commented-out code.

This removes 2844 net Go lines while retaining Gitea RPC, event, matrix, input, cache, artifact, action, reusable workflow, Docker, host, exec, and release behavior.

Assisted by Codex (GPT-5).

Reviewed-on: https://gitea.com/gitea/runner/pulls/1179
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

internal/pkg/client/client.go

@@ -4,16 +4,17 @@
 package client
 
 import (
-	"gitea.dev/actionslib/ping/v1/pingv1connect"
-	"gitea.dev/actionslib/runner/v1/runnerv1connect"
+	"context"
+
+	"connectrpc.com/connect"
+	"gitea.dev/actionslib/runner/v1"
 )
 
 // A Client manages communication with the runner.
-//
-//go:generate mockery --name Client
 type Client interface {
-	pingv1connect.PingServiceClient
-	runnerv1connect.RunnerServiceClient
 	Address() string
-	Insecure() bool
+	Declare(context.Context, *connect.Request[runnerv1.DeclareRequest]) (*connect.Response[runnerv1.DeclareResponse], error)
+	FetchTask(context.Context, *connect.Request[runnerv1.FetchTaskRequest]) (*connect.Response[runnerv1.FetchTaskResponse], error)
+	UpdateLog(context.Context, *connect.Request[runnerv1.UpdateLogRequest]) (*connect.Response[runnerv1.UpdateLogResponse], error)
+	UpdateTask(context.Context, *connect.Request[runnerv1.UpdateTaskRequest]) (*connect.Response[runnerv1.UpdateTaskResponse], error)
 }