feat(21-22): agente AI generazione preventivo + pagina pubblica deck

- Migration 0010: tabella proposals (id, slug, lead_id, client_id,
  offer_macro_id, content jsonb, state, selected_tier, accepted_at)
  applicata a prod via SSH tunnel
- @anthropic-ai/sdk@0.105.0 installato; ANTHROPIC_API_KEY in .env.local
- src/lib/proposal/: schema Zod ProposalContent, agente Claude Opus 4.8,
  assemble (AI + offerta DB + config consulente), queries, profile.ts
- Admin: /admin/preventivi lista + /genera (pre-fill ?lead_id=X) + /[id] review
- Sidebar: voce Preventivi + CTA globale lime "Genera preventivo"
- LeadDetail: pulsante "Genera preventivo" → /admin/preventivi/genera?lead_id=X
- Pagina pubblica /preventivo/[slug]: deck 20+ slide light-mode iamcavalli,
  navigazione frecce + dot + keyboard, accept/reject con guard immutabilità
- STATE.md aggiornato (80%), 21-PLAN.md scritto nel formato GSD

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

@@ -8,6 +8,7 @@
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       "dependencies": {
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         "@dnd-kit/core": "^6.3.1",
         "@dnd-kit/sortable": "^10.0.0",
         "@dnd-kit/utilities": "^3.2.2",
@@ -59,6 +60,27 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@anthropic-ai/sdk": {
+      "version": "0.105.0",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.105.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "standardwebhooks": "^1.0.0"
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+      "bin": {
+        "anthropic-ai-sdk": "bin/cli"
+      },
+      "peerDependencies": {
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+      },
+      "peerDependenciesMeta": {
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@@ -3802,6 +3824,12 @@
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       "license": "MIT"
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@@ -7342,6 +7376,19 @@
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       "license": "MIT"
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+      "license": "MIT",
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@@ -9038,6 +9085,16 @@
       "dev": true,
       "license": "MIT"
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+    "node_modules/standardwebhooks": {
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+      "resolved": "https://registry.npmjs.org/standardwebhooks/-/standardwebhooks-1.0.0.tgz",
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+      "license": "MIT",
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+        "fast-sha256": "^1.3.0"
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@@ -9329,6 +9386,12 @@
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+    "node_modules/ts-algebra": {
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