fix(webadmin): subscription metrics only track 2 of 7 Stripe products

[beastoin]

Problem

The web admin dashboard subscription routes hardcode two Stripe price IDs (STRIPE_UNLIMITED_MONTHLY_PRICE_ID, STRIPE_UNLIMITED_ANNUAL_PRICE_ID). All other products are invisible to the dashboard.

Missing products (5 of 7)

• Omi Unlimited v2
• Operator
• Omi Architect
• Omi Plus
• Neo
• Enterprise

Affected routes

Route	Impact
revenue/route.ts	MRR/ARR undercounted — only sums 2 price IDs
subscriptions/route.ts	Subscription count misses 5 products
mrr-trends/route.ts	Historical MRR trend chart undercounts
subscription-trends/route.ts	New subscription trend misses 5 products
profitability/route.ts	Per-platform MRR and conversion undercounted
app-subscriptions/route.ts	Subs from missing products leak into "non-Omi" bucket

Status filter too narrow

revenue and subscriptions routes query only status: 'active'. Standard SaaS MRR should include active + past_due (Stripe is still retrying payment; subscription is intact). trialing should be excluded from MRR but shown separately.

Root cause

Code was written when Omi had one product (Unlimited monthly + annual). As new products launched, these routes were never updated.

Correct approach

1. Query all subscriptions without price-ID filtering (stripe.subscriptions.list with status: 'active' and status: 'past_due')
2. Group by product using item.price.product — no hardcoded product IDs
3. Compute MRR per product: monthly as-is, annual ÷ 12 (detect via price.recurring.interval)
4. Show trialing subscriptions as a separate pipeline metric, not in MRR
5. New products added to Stripe appear automatically — no env var or code change needed

by AI for @beastoin