feat: Discord/Slack/ntfy/Matrix targets, command templates, delete protection, email/matrix bots

- Discord, Slack, ntfy, Matrix notification target types with clients and dispatch
- MatrixBot model + API + frontend in Bots tab
- Command template system fully wired into all handler commands
- Default command templates seeded (EN/RU, 14 slots each)
- Command template editor with variables reference including child fields
- Delete protection on all 10 entity types (409 with consumer details)
- Provider type selector on template config forms
- Target type selector as dropdown with all 7 types
- Response template selector on command config form
- CLAUDE.md: mandatory server restart rule, child properties rule

frontend/src/routes/command-template-configs/+page.svelte

@@ -42,9 +42,15 @@
 	let slotErrorLines = $state<Record<string, number | null>>({});
 	let slotErrorTypes = $state<Record<string, string>>({});
 	let validateTimers: Record<string, ReturnType<typeof setTimeout>> = {};
+	let varsRef = $state<Record<string, any>>({});
+	let showVarsFor = $state<string | null>(null);
 
-	// Load command slot definitions from capabilities
-	let commandSlots = $state<SlotDef[]>([]);
+	// Provider capabilities
+	let allCapabilities = $state<Record<string, any>>({});
+	let providerTypes = $derived(Object.keys(allCapabilities));
+	let commandSlots = $derived<SlotDef[]>(
+		allCapabilities[form.provider_type]?.command_slots || []
+	);
 
 	const defaultForm = () => ({
 		provider_type: 'immich',
@@ -59,12 +65,14 @@
 
 	async function load() {
 		try {
-			const [cfgs, caps] = await Promise.all([
+			const [cfgs, caps, vars] = await Promise.all([
 				api('/command-template-configs'),
-				api('/providers/capabilities/immich'),
+				api('/providers/capabilities'),
+				api('/command-template-configs/variables'),
 			]);
 			configs = cfgs;
-			commandSlots = caps.command_slots || [];
+			allCapabilities = caps;
+			varsRef = vars;
 		} catch (err: any) {
 			error = err.message || t('common.loadError');
 			snackError(error);
@@ -218,6 +226,23 @@
 				class="w-full px-3 py-2 border border-[var(--color-border)] rounded-md text-sm bg-[var(--color-background)]" />
 		</div>
 
+		{#if !editing}
+		<div>
+			<label for="ct-provider" class="block text-sm font-medium mb-1">{t('templateConfig.providerType')}</label>
+			<select id="ct-provider" bind:value={form.provider_type}
+				class="w-full px-3 py-2 border border-[var(--color-border)] rounded-md text-sm bg-[var(--color-background)]">
+				{#each providerTypes as pt}
+					<option value={pt}>{allCapabilities[pt]?.display_name || pt} ({pt})</option>
+				{/each}
+			</select>
+		</div>
+		{:else}
+		<div>
+			<span class="block text-sm font-medium mb-1">{t('templateConfig.providerType')}</span>
+			<span class="text-sm text-[var(--color-muted-foreground)]">{allCapabilities[form.provider_type]?.display_name || form.provider_type}</span>
+		</div>
+		{/if}
+
 		<fieldset class="border border-[var(--color-border)] rounded-md p-3">
 			<legend class="text-sm font-medium px-1">{t('cmdTemplateConfig.commandResponses')}</legend>
 			<p class="text-xs text-[var(--color-muted-foreground)] mb-3">{t('cmdTemplateConfig.commandResponsesHint')}</p>
@@ -225,8 +250,11 @@
 				{#each commandSlots as slot}
 					<div>
 						<div class="flex items-center justify-between mb-1">
-							<label class="text-xs text-[var(--color-muted-foreground)]">/{slot.name}</label>
-							<span class="text-xs text-[var(--color-muted-foreground)]">{slot.description}</span>
+							<label class="text-xs text-[var(--color-muted-foreground)]">/{slot.name} — {slot.description}</label>
+							{#if varsRef[slot.name]}
+								<button type="button" onclick={() => showVarsFor = slot.name}
+									class="text-xs text-[var(--color-muted-foreground)] hover:underline">{t('templateConfig.variables')}</button>
+							{/if}
 						</div>
 						<JinjaEditor
 							value={form.slots[slot.name] || ''}
@@ -272,6 +300,7 @@
 						<div class="flex items-center gap-2">
 							<span style="color: var(--color-primary);"><MdiIcon name={config.icon || 'mdiConsoleLine'} size={20} /></span>
 							<p class="font-medium">{config.name}</p>
+							<span class="text-xs px-1.5 py-0.5 rounded bg-[var(--color-muted)] text-[var(--color-muted-foreground)]">{config.provider_type}</span>
 							{#if config.user_id === 0}
 								<span class="text-xs px-1.5 py-0.5 rounded bg-[var(--color-muted)] text-[var(--color-muted-foreground)]">System</span>
 							{/if}
@@ -296,3 +325,37 @@
 
 <ConfirmModal open={confirmDelete !== null} message={t('cmdTemplateConfig.confirmDelete')}
 	onconfirm={() => confirmDelete?.onconfirm()} oncancel={() => confirmDelete = null} />
+
+<!-- Variables reference modal -->
+<Modal open={showVarsFor !== null} title="{t('templateConfig.variables')}: /{showVarsFor || ''}" onclose={() => showVarsFor = null}>
+	{#if showVarsFor && varsRef[showVarsFor]}
+		<p class="text-sm text-[var(--color-muted-foreground)] mb-3">{varsRef[showVarsFor].description}</p>
+		<div class="space-y-1">
+			<p class="text-xs font-medium mb-1">{t('templateConfig.variables')}:</p>
+			{#each Object.entries(varsRef[showVarsFor].variables || {}) as [name, desc]}
+				<div class="flex items-start gap-2 text-sm">
+					<code class="text-xs bg-[var(--color-muted)] px-1 py-0.5 rounded font-mono whitespace-nowrap">{'{{ ' + name + ' }}'}</code>
+					<span class="text-xs text-[var(--color-muted-foreground)]">{desc}</span>
+				</div>
+			{/each}
+		</div>
+		{#each [
+			['asset_fields', 'asset', 'Asset fields'],
+			['album_fields', 'album', 'Album fields'],
+			['command_fields', 'cmd', 'Command fields'],
+			['event_fields', 'event', 'Event fields'],
+		] as [fieldKey, prefix, title]}
+			{#if varsRef[showVarsFor][fieldKey]}
+				<div class="mt-3 pt-3 border-t border-[var(--color-border)]">
+					<p class="text-xs font-medium mb-1">{title} <span class="font-normal text-[var(--color-muted-foreground)]">(use {prefix}.field)</span>:</p>
+					{#each Object.entries(varsRef[showVarsFor][fieldKey]) as [name, desc]}
+						<div class="flex items-start gap-2 text-sm">
+							<code class="text-xs bg-[var(--color-muted)] px-1 py-0.5 rounded font-mono whitespace-nowrap">{'{{ ' + prefix + '.' + name + ' }}'}</code>
+							<span class="text-xs text-[var(--color-muted-foreground)]">{desc}</span>
+						</div>
+					{/each}
+				</div>
+			{/if}
+		{/each}
+	{/if}
+</Modal>