fix(commands): enrich search assets, surface variables for all command slots

- UI: command-template-configs now resolves slot variables against the
  active provider first (varsRef[provider_type][slot]) before falling back
  to shared entries, so provider-specific slots like /search, /status,
  /repos, /issues, /boards show the Variables button and autocomplete.
- Backend: /search, /find, /person, /place now normalize raw Immich API
  responses through build_asset_dict, extracting city/country from
  exifInfo and mapping isFavorite -> is_favorite so templates render
  location and favorite indicators.
- Telegram: extract build_telegram_asset_entry into a shared helper so
  the notification dispatcher and command media groups agree on video
  typing and /video/playback URLs; videos no longer render as still
  thumbnails in /latest /random /favorites media mode.
- Commands: send_media_group now reuses the same Telegram file_id caches
  as the notification dispatcher, avoiding re-upload churn for repeated
  commands.

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

@@ -117,6 +117,14 @@
 		return form.slots[slotName]?.[activeLocale] || '';
 	}
 
+	/** Resolve variable reference for a slot, preferring provider-specific over shared. */
+	function getVarsFor(slotName: string) {
+		const providerVars = varsRef[form.provider_type];
+		return providerVars?.[slotName] ?? varsRef[slotName];
+	}
+
+	let modalVars = $derived(showVarsFor ? getVarsFor(showVarsFor) : null);
+
 	/** Set slot template for current locale (immutable update). */
 	function setSlotValue(slotName: string, value: string) {
 		form.slots = {
@@ -369,7 +377,7 @@
 									{t('templateConfig.preview')}
 								</button>
 							{/if}
-							{#if varsRef[slot.name]}
+							{#if getVarsFor(slot.name)}
 								<button type="button" onclick={() => showVarsFor = slot.name}
 									class="text-xs text-[var(--color-muted-foreground)] hover:underline">{t('templateConfig.variables')}</button>
 							{/if}
@@ -385,7 +393,7 @@
 								onchange={(v: string) => { setSlotValue(slot.name, v); validateSlot(slot.name, v); }}
 								rows={3}
 								errorLine={slotErrorLines[slot.name] || null}
-								variables={varsRef[slot.name] || undefined}
+								variables={getVarsFor(slot.name) || undefined}
 							/>
 						{/if}
 
@@ -468,11 +476,11 @@
 
 <!-- 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>
+	{#if showVarsFor && modalVars}
+		<p class="text-sm text-[var(--color-muted-foreground)] mb-3">{modalVars.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]}
+			{#each Object.entries(modalVars.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>
@@ -484,11 +492,19 @@
 			['album_fields', 'album', 'Album fields'],
 			['command_fields', 'cmd', 'Command fields'],
 			['event_fields', 'event', 'Event fields'],
+			['repo_fields', 'repo', 'Repository fields'],
+			['issue_fields', 'issue', 'Issue fields'],
+			['pr_fields', 'pr', 'Pull request fields'],
+			['commit_fields', 'c', 'Commit fields'],
+			['board_fields', 'board', 'Board fields'],
+			['card_fields', 'card', 'Card fields'],
+			['list_fields', 'lst', 'List fields'],
+			['device_fields', 'd', 'Device fields'],
 		] as [fieldKey, prefix, title]}
-			{#if varsRef[showVarsFor][fieldKey]}
+			{#if modalVars[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]}
+					{#each Object.entries(modalVars[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>