Fix deploy: force Docker rebuild, add version check and redeploy script

internal/handlers/customer.go

@@ -1,6 +1,7 @@
 package handlers
 
 import (
+	"fmt"
 	"html/template"
 	"log"
 	"net/http"
@@ -9,6 +10,7 @@ import (
 	"shop/internal/auth"
 	"shop/internal/models"
 	"shop/internal/repository"
+	"shop/internal/version"
 )
 
 type CustomerHandler struct {
@@ -26,6 +28,7 @@ type shopPage struct {
 	Title      string
 	User       *models.User
 	CartCount  int
+	Version    string
 	Products   interface{}
 	Categories interface{}
 	Error      string
@@ -73,13 +76,14 @@ func NewCustomerHandler(
 
 func (h *CustomerHandler) render(w http.ResponseWriter, name string, data any) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
 	if err := h.templates.ExecuteTemplate(w, name, data); err != nil {
 		log.Printf("render %s: %v", name, err)
 	}
 }
 
 func (h *CustomerHandler) basePage(r *http.Request, w http.ResponseWriter, title string) shopPage {
-	p := shopPage{Title: title}
+	p := shopPage{Title: title, Version: version.Version}
 	if uid, ok := auth.UserIDFromSession(h.userSession, r); ok {
 		if u, err := h.users.GetByID(r.Context(), uid); err == nil {
 			p.User = &u
@@ -373,5 +377,6 @@ func (h *CustomerHandler) Account(w http.ResponseWriter, r *http.Request) {
 
 func (h *CustomerHandler) Health(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
-	w.Write([]byte(`{"status":"ok"}`))
+	w.Header().Set("Cache-Control", "no-store")
+	fmt.Fprintf(w, `{"status":"ok","version":%q}`, version.Version)
 }

internal/handlers/templates/home.html

@@ -118,7 +118,7 @@
             <div class="footer__brand">
                 <span class="logo__icon">◆</span>
                 <span class="logo__text">Shop</span>
-                <p class="footer__copy">© 2026 Shop. Все права защищены.</p>
+                <p class="footer__copy">© 2026 Shop · v{{.Version}}</p>
             </div>
             <div class="footer__links">
                 <a href="/account">Личный кабинет</a>

internal/version/version.go

@@ -0,0 +1,4 @@
+package version
+
+// Version задаётся при сборке: -ldflags "-X shop/internal/version.Version=..."
+var Version = "dev"