initial agent-mgr: app builder platform MVP

Go API server + Preact UI + Claude Code adapter.
- App-centric model (ideas, not repos)
- AgentProvider interface for multi-agent support
- K8s pod lifecycle for sandboxed agent sessions
- Gitea integration (create repos, push branches)
- WebSocket streaming for live session output
- Woodpecker CI/CD pipelines (kaniko build + kubectl deploy)

internal/provider/provider.go

@@ -0,0 +1,55 @@
+package provider
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+
+	"github.com/google/uuid"
+)
+
+type Status string
+
+const (
+	StatusPending   Status = "pending"
+	StatusRunning   Status = "running"
+	StatusCompleted Status = "completed"
+	StatusFailed    Status = "failed"
+	StatusStopped   Status = "stopped"
+)
+
+type SessionConfig struct {
+	SessionID  uuid.UUID       `json:"session_id"`
+	AppName    string          `json:"app_name"`
+	RepoClone  string          `json:"repo_clone_url"`
+	Branch     string          `json:"branch"`
+	Prompt     string          `json:"prompt"`
+	Provider   json.RawMessage `json:"provider_config,omitempty"`
+}
+
+type SessionHandle struct {
+	SessionID uuid.UUID
+	PodName   string
+}
+
+type Capability struct {
+	Name        string `json:"name"`
+	Description string `json:"description"`
+}
+
+type Info struct {
+	Name         string       `json:"name"`
+	DisplayName  string       `json:"display_name"`
+	Description  string       `json:"description"`
+	Capabilities []Capability `json:"capabilities"`
+	ConfigSchema json.RawMessage `json:"config_schema,omitempty"`
+}
+
+type AgentProvider interface {
+	Info() Info
+	CreateSession(ctx context.Context, cfg SessionConfig) (*SessionHandle, error)
+	StopSession(ctx context.Context, handle *SessionHandle) error
+	SendMessage(ctx context.Context, handle *SessionHandle, msg string) error
+	StreamOutput(ctx context.Context, handle *SessionHandle) (io.ReadCloser, error)
+	GetStatus(ctx context.Context, handle *SessionHandle) (Status, error)
+}