feat: provider-strict configs, slot-based templates, broadcast targets, email bots, command templates

Major architectural improvements:
- Provider-type enforcement: configs validated against provider type at assignment
- TemplateConfig migrated to slot-based pattern (TemplateSlot child table)
- Broadcast targets: TargetReceiver child table for multi-receiver dispatch
- EmailBot: first-class email sender entity with SMTP config, test connection
- CommandTemplateConfig: generic slot-based command response templates
- Provider capability registry: dynamic slot/event/command definitions per provider
- CommandTracker play/pause button matches NotificationTracker style

frontend/src/lib/i18n/en.json

@@ -13,6 +13,7 @@
 		"targets": "Targets",
 		"commandConfigs": "Cmd Configs",
 		"commandTrackers": "Cmd Trackers",
+		"cmdTemplateConfigs": "Cmd Templates",
 		"users": "Users",
 		"settings": "Settings",
 		"logout": "Logout"
@@ -478,6 +479,36 @@
 		"botLocale": "Language for command descriptions in Telegram's menu and bot response messages.",
 		"rateLimits": "Cooldown in seconds between uses of each command category per chat. 0 = no limit."
 	},
+	"emailBot": {
+		"title": "Email Bots",
+		"description": "SMTP email senders for notifications",
+		"addBot": "Add Email Bot",
+		"name": "Name",
+		"namePlaceholder": "Family Notifications",
+		"email": "From Email",
+		"smtpHost": "SMTP Host",
+		"smtpPort": "Port",
+		"smtpUsername": "Username",
+		"smtpUsernamePlaceholder": "Same as email or app password",
+		"smtpPassword": "Password",
+		"passwordUnchanged": "(unchanged)",
+		"useTls": "Use TLS/SSL",
+		"testConnection": "Send test email",
+		"noBots": "No email bots yet.",
+		"confirmDelete": "Delete this email bot?"
+	},
+	"cmdTemplateConfig": {
+		"title": "Command Templates",
+		"description": "Customize command response messages with Jinja2 templates",
+		"newConfig": "New Config",
+		"name": "Name",
+		"namePlaceholder": "Default Immich Commands",
+		"descriptionPlaceholder": "e.g. Custom response formats for family bot",
+		"noConfigs": "No command template configs yet.",
+		"confirmDelete": "Delete this command template config?",
+		"commandResponses": "Command Responses",
+		"commandResponsesHint": "Leave a slot empty to use the default hardcoded response."
+	},
 	"commandConfig": {
 		"title": "Command Configs",
 		"description": "Define command settings for Telegram bot interactions",
@@ -558,7 +589,13 @@
 		"commandTrackerEnabled": "Command tracker enabled",
 		"commandTrackerDisabled": "Command tracker disabled",
 		"listenerAdded": "Listener added",
-		"listenerRemoved": "Listener removed"
+		"listenerRemoved": "Listener removed",
+		"cmdTemplateSaved": "Command template saved",
+		"cmdTemplateDeleted": "Command template deleted",
+		"emailBotCreated": "Email bot created",
+		"emailBotUpdated": "Email bot updated",
+		"emailBotDeleted": "Email bot deleted",
+		"emailBotTestSent": "Test email sent successfully"
 	},
 	"common": {
 		"loading": "Loading...",