refactor(pricing): refonte v7.0 — 3 Cloud (Basic 189$/Essentiel 349$/Pro 549$) + DictIA Local (5998$ An1) + Pro+ soumission

Remplace l'ancien pricing (DictIA 8 / 16 / Cloud) par la nouvelle structure
canonique v7.0 : 4 forfaits + 1 sentinel quote-only.

Changements clés :
- pricing_card.html : signature étendue (badge, recommended, capacity_audio,
  capacity_storage, gpu, yearly_renewal, cta_label) + format prix server-side
  avec NBSP OQLF (5998 -> 5 998 $)
- _pricing_tiers.html : 4 cards (Cloud Basic 189$, Cloud Essentiel 349$,
  Cloud Pro 549$+485$ RECOMMANDÉ, DictIA Local 5998$ An1) + chip Pro+
  soumission -> /contact?pro-plus=1
- plans.py : refonte complète avec yearly_renewal_env (DictIA Local An 2+ =
  500$/an) + is_quote_only sentinel (Pro+ -> redirect /contact, jamais Stripe)
- routes.py : Pro+ intercepté avant le flow Stripe Checkout
- env.stripe.example : nouveau naming STRIPE_CLOUD_BASIC|ESSENTIEL|PRO_*
  + STRIPE_DICTIA_LOCAL_SETUP/RENEWAL_YEARLY
- tarifs.html : header "Quatre forfaits", matrice comparative 4 colonnes,
  FAQ enrichie (7 questions incluant DictIA Local + onboarding Pro + Pro+)
- fonctionnalites.html : section Architecture refondue (4 cards v7.0)
- landing.html : ROI footnote + cycle "189$" + wave "189$/mois" actualisés
- roi_calculator.js : recalibrage sur Cloud ESSENTIEL 349$ × 12 = 4188$/an
- routes.py marketing : FAQ "DictIA 8 et 16" -> "DictIA LOCAL"
- contact.html : "déploiements DictIA 16" -> "Cloud PRO" + "DictIA LOCAL"

Tests :
- test_marketing_landing_template.py : assertions prix v7.0 (189/349/549/5998),
  4 slugs (cloud-basic, cloud-essentiel, cloud-pro, dictia-local), Pro+ chip,
  capacity chips, RECOMMANDÉ sur Cloud PRO
- test_marketing_secondary_pages.py : 4 cards + Pro+ chip + matrice 4 col +
  FAQ 7 questions
- test_stripe_checkout.py : env vars v7.0, slugs cloud-basic/cloud-pro/
  dictia-local + nouveau test pro-plus -> /contact + tests setup pour Cloud PRO
  et DictIA Local
- test_stripe_webhook.py : plan_slug metadata cloud-basic

Status : 28/28 Stripe checkout + 17/17 webhook + 93/98 marketing pass
(les 5 marketing failures sont pré-existantes, non liées au pricing :
test_landing_has_main_nav et test_footer_links_complete = /blog manquant ;
test_trust_bar_has_eyebrow_factual_phrasing + 2 tests conformite =
casing eyebrow + entité é — vérifié par git stash baseline).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

static/css/marketing.css

@@ -49,8 +49,6 @@
     --color-green-700: oklch(52.7% 0.154 150.069);
     --color-green-800: oklch(44.8% 0.119 151.328);
     --color-green-900: oklch(39.3% 0.095 152.535);
-    --color-emerald-50: oklch(97.9% 0.021 166.113);
-    --color-emerald-100: oklch(95% 0.052 163.051);
     --color-emerald-500: oklch(69.6% 0.17 162.48);
     --color-emerald-600: oklch(59.6% 0.145 163.225);
     --color-emerald-700: oklch(50.8% 0.118 165.612);
@@ -1169,12 +1167,18 @@
   .min-w-\[180px\] {
     min-width: 180px;
   }
+  .min-w-\[260px\] {
+    min-width: 260px;
+  }
   .min-w-\[300px\] {
     min-width: 300px;
   }
   .min-w-\[720px\] {
     min-width: 720px;
   }
+  .min-w-\[820px\] {
+    min-width: 820px;
+  }
   .min-w-full {
     min-width: 100%;
   }
@@ -1765,6 +1769,9 @@
   .border-brand-b3\/15 {
     border-color: color-mix(in oklab, #c026d3 15%, transparent);
   }
+  .border-brand-b3\/20 {
+    border-color: color-mix(in oklab, #c026d3 20%, transparent);
+  }
   .border-brand-b3\/60 {
     border-color: color-mix(in oklab, #c026d3 60%, transparent);
   }
@@ -2074,6 +2081,9 @@
   .bg-brand-b2\/20 {
     background-color: color-mix(in oklab, #06b6d4 20%, transparent);
   }
+  .bg-brand-b2\/\[0\.08\] {
+    background-color: color-mix(in oklab, #06b6d4 8%, transparent);
+  }
   .bg-brand-b3 {
     background-color: #c026d3;
   }
@@ -2083,6 +2093,9 @@
   .bg-brand-b3\/60 {
     background-color: color-mix(in oklab, #c026d3 60%, transparent);
   }
+  .bg-brand-b3\/\[0\.08\] {
+    background-color: color-mix(in oklab, #c026d3 8%, transparent);
+  }
   .bg-brand-bg {
     background-color: #f7f9fc;
   }
@@ -3304,6 +3317,12 @@
       color: color-mix(in oklab, var(--color-white) 70%, transparent);
     }
   }
+  .text-white\/75 {
+    color: color-mix(in srgb, #fff 75%, transparent);
+    @supports (color: color-mix(in lab, red, red)) {
+      color: color-mix(in oklab, var(--color-white) 75%, transparent);
+    }
+  }
   .text-white\/80 {
     color: color-mix(in srgb, #fff 80%, transparent);
     @supports (color: color-mix(in lab, red, red)) {