fix: extract hardcoded English strings to i18n system with Russian translations

- Extract ~40 hardcoded strings from project detail, deploy, settings, credentials, registries, auth, env editor pages
- Add corresponding Russian translations
- Replace native confirm() default labels with i18n keys in ConfirmDialog
- Fix InstanceCard pluralization to use i18n

web/src/lib/i18n/en.json

@@ -55,7 +55,10 @@
     "selectImage": "Select an image",
     "noImages": "No images found",
     "loadingImages": "Loading images...",
-    "imageLoadFailed": "Failed to load images"
+    "imageLoadFailed": "Failed to load images",
+    "alreadyAdded": "Already added",
+    "portHelpText": "Auto-detected from EXPOSE if empty",
+    "healthcheckHelpText": "Auto-detected from image if empty"
   },
   "projectDetail": {
     "deleteProject": "Delete Project",
@@ -86,7 +89,29 @@
     "deleteConfirmMessage": "This will permanently delete the project '{name}' and all its stages, instances, and deploy history. This cannot be undone.",
     "loadFailed": "Failed to load project",
     "deleteFailed": "Failed to delete project",
-    "deployFailed": "Deploy failed"
+    "deployFailed": "Deploy failed",
+    "nameLabel": "Name *",
+    "imageLabel": "Image *",
+    "portLabel": "Port",
+    "healthcheckLabel": "Healthcheck Path",
+    "saving": "Saving...",
+    "addStage": "Add Stage",
+    "tagPattern": "Tag Pattern",
+    "tagPatternHelp": "Glob pattern (e.g., dev-*, v*)",
+    "maxInstances": "Max Instances",
+    "autoDeployLabel": "Auto Deploy",
+    "npmProxy": "NPM Proxy",
+    "creating": "Creating...",
+    "createStage": "Create Stage",
+    "noProxy": "No Proxy",
+    "deleteStage": "Delete stage",
+    "deleteStageConfirm": "Delete stage \"{name}\"?",
+    "stageCreated": "Stage \"{name}\" created",
+    "stageDeleted": "Stage \"{name}\" deleted",
+    "projectUpdated": "Project updated",
+    "updateFailed": "Failed to update project",
+    "stageCreateFailed": "Failed to create stage",
+    "stageDeleteFailed": "Failed to delete stage"
   },
   "envEditor": {
     "title": "Environment Variables",
@@ -117,7 +142,8 @@
     "addFailed": "Failed to add env var",
     "updateFailed": "Failed to update env var",
     "deleteFailed": "Failed to delete env var",
-    "loadEnvFailed": "Failed to load env vars"
+    "loadEnvFailed": "Failed to load env vars",
+    "leaveEmptyToKeep": "Leave empty to keep current"
   },
   "volumeEditor": {
     "title": "Volume Mounts",
@@ -196,7 +222,8 @@
     "selectImage": "Select an image from a registry",
     "noImages": "No images found",
     "loadingImages": "Loading...",
-    "imageLoadFailed": "Failed to load images"
+    "imageLoadFailed": "Failed to load images",
+    "lowercaseHint": "Lowercase with hyphens"
   },
   "settings": {
     "title": "Settings",
@@ -264,7 +291,9 @@
     "testConnection": "Test Connection",
     "testingConnection": "Testing...",
     "connectionSuccess": "Connection successful",
-    "connectionFailed": "Connection failed"
+    "connectionFailed": "Connection failed",
+    "baseVolumePath": "Base Volume Path",
+    "baseVolumePathHelp": "Prepended to relative volume sources (e.g., /data + my-app/uploads = /data/my-app/uploads)"
   },
   "settingsRegistries": {
     "title": "Container Registries",
@@ -300,7 +329,10 @@
     "deleteFailed": "Failed to delete registry",
     "testFailed": "Connection test failed",
     "loadFailed": "Failed to load registries",
-    "deleteConfirm": "Delete registry \"{name}\"? This cannot be undone."
+    "deleteConfirm": "Delete registry \"{name}\"? This cannot be undone.",
+    "healthChecking": "Checking...",
+    "healthConnected": "Connected",
+    "healthUnreachable": "Unreachable"
   },
   "settingsCredentials": {
     "title": "Credentials",
@@ -324,7 +356,8 @@
     "registryTokens": "Registry Tokens",
     "registryTokensDesc": "Registry authentication tokens are managed per-registry in the",
     "registriesLink": "Registries",
-    "registryTokensSuffix": "section. Each registry stores its token encrypted in the database."
+    "registryTokensSuffix": "section. Each registry stores its token encrypted in the database.",
+    "notSet": "Not set"
   },
   "settingsBackup": {
     "title": "Backup Management",
@@ -395,6 +428,7 @@
     "deleteFailed": "Failed to delete user",
     "deleteConfirm": "Are you sure you want to delete this user?",
     "usernameRequired": "Username and password are required",
+    "networkError": "Network error",
     "password": "Password"
   },
   "login": {
@@ -486,7 +520,10 @@
     "stopInstance": "Stop Instance",
     "startInstance": "Start Instance",
     "restartInstance": "Restart Instance",
-    "removeInstance": "Remove Instance"
+    "removeInstance": "Remove Instance",
+    "stopAction": "Stop",
+    "restartAction": "Restart",
+    "removeAction": "Remove"
   },
   "theme": {
     "light": "Light",