Add GET/POST /settings handlers with injected applier

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/web/web.go

@@ -14,6 +14,7 @@ import (
 
 	"antidrift/internal/domain"
 	"antidrift/internal/session"
+	"antidrift/internal/settings"
 	"antidrift/internal/statemachine"
 
 	"github.com/gin-gonic/gin"
@@ -29,6 +30,11 @@ type Server struct {
 
 	mu    sync.Mutex
 	timer *time.Timer
+
+	settingsMu   sync.Mutex
+	settings     settings.Settings
+	settingsPath string
+	applyFn      func(settings.Settings) error
 }
 
 func NewServer(ctrl *session.Controller) *Server {
@@ -69,6 +75,8 @@ func (s *Server) Router() *gin.Engine {
 	r.POST("/refocus", s.handleRefocus)
 	r.POST("/ontask", s.handleOnTask)
 	r.POST("/knowledge/path", s.handleKnowledgePath)
+	r.GET("/settings", s.handleGetSettings)
+	r.POST("/settings", s.handlePostSettings)
 	return r
 }