fix(mana-llm): google-genai v1.73 keyword-only Part.from_text()

google-genai >=1.70 changed Part.from_text() from positional to
keyword-only argument. The production container installed v1.73.1
and crashed on startup with "Part.from_text() takes 1 positional
argument but 2 were given".

Fix: Part.from_text(msg.content) → Part.from_text(text=msg.content)

Tested live: curl https://llm.mana.how/v1/chat/completions with
model=google/gemini-2.5-flash returns correct response.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/subscriptions/src/pages/SubscriptionPage.svelte

@@ -68,11 +68,13 @@
 	<section class="section">
 		<h2 class="section-title">{subscriptionsTitle}</h2>
 		<div class="card-list">
-			<SubscriptionCard
-				plan={subscriptions.find((plan) => plan.id === 'free')}
-				onSelect={onSubscribe}
-				isCurrentPlan={isCurrentPlan('free')}
-			/>
+			{#if subscriptions.find((p) => p.id === 'free')}
+				<SubscriptionCard
+					plan={subscriptions.find((p) => p.id === 'free')!}
+					onSelect={onSubscribe}
+					isCurrentPlan={isCurrentPlan('free')}
+				/>
+			{/if}
 			{#each getSubscriptionPlans() as plan}
 				<SubscriptionCard {plan} onSelect={onSubscribe} isCurrentPlan={isCurrentPlan(plan.id)} />
 			{/each}