v0.6: template-manager owns the product catalog

The host no longer carries a runtime product catalog. products.js
shrinks to a legacy single-product stub; the canonical catalog lives in
template-manager's productsStore, seeded ONCE on first boot from the
new seedProducts.js (after that the store under templates/ is
authoritative and the seed is ignored — intentional, so restarts never
rewrite an admin-managed catalog). phoneModels.js and
templateCategories.js are the supporting constant sets, and
docs/template-schema.md documents the v4 schema.

templates/ is the admin-managed store itself (_products_index.json +
products/<id>/product.json, JSON only) — committed so the configured
catalog (sizes, pricing, options built up in the admin UI) survives a
fresh checkout rather than regressing to the seed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

templates/products/c3ac22c7-ef49-4997-a525-d4f0eb32da6f/product.json

@@ -0,0 +1,154 @@
+{
+  "id": "c3ac22c7-ef49-4997-a525-d4f0eb32da6f",
+  "slug": "shirt",
+  "label": "T-Shirt",
+  "description": "Soft cotton tee, printed on the front.",
+  "category": "Apparel",
+  "options": [
+    {
+      "id": "9d58a8b1-5976-4512-9095-883f16a4c1b8",
+      "slug": "color",
+      "label": "Color",
+      "kind": "color",
+      "values": [
+        {
+          "id": "29092f97-2654-4150-89e5-7a323eb891e4",
+          "slug": "white",
+          "label": "White",
+          "hex": "#ffffff"
+        },
+        {
+          "id": "c25f746a-efc2-4213-9328-728ac6881bc6",
+          "slug": "black",
+          "label": "Black",
+          "hex": "#1f2937"
+        },
+        {
+          "id": "8e077db8-bc48-45c0-a3e1-df10b6f1367f",
+          "slug": "pink",
+          "label": "Dusty Pink",
+          "hex": "#fbcfe8"
+        }
+      ]
+    }
+  ],
+  "sizes": [
+    {
+      "id": "3df58f51-70ce-4898-8091-2bb186b04193",
+      "slug": "s",
+      "label": "Small",
+      "physical": {
+        "width": 12,
+        "height": 16,
+        "unit": "in"
+      },
+      "canvas": {
+        "width": 1200,
+        "height": 1600
+      },
+      "printZone": {
+        "x": 120,
+        "y": 160,
+        "width": 960,
+        "height": 1280
+      },
+      "silhouettePath": "M48,0 L1152,0 A48,48 0 0 1 1200,48 L1200,1552 A48,48 0 0 1 1152,1600 L48,1600 A48,48 0 0 1 0,1552 L0,48 A48,48 0 0 1 48,0 Z",
+      "mockupFallbackColor": "#f4f4f5",
+      "basePriceCents": 2200
+    },
+    {
+      "id": "86787c88-c4e0-4798-a34f-d1e173b2704b",
+      "slug": "m",
+      "label": "Medium",
+      "physical": {
+        "width": 12,
+        "height": 16,
+        "unit": "in"
+      },
+      "canvas": {
+        "width": 1200,
+        "height": 1600
+      },
+      "printZone": {
+        "x": 120,
+        "y": 160,
+        "width": 960,
+        "height": 1280
+      },
+      "silhouettePath": "M48,0 L1152,0 A48,48 0 0 1 1200,48 L1200,1552 A48,48 0 0 1 1152,1600 L48,1600 A48,48 0 0 1 0,1552 L0,48 A48,48 0 0 1 48,0 Z",
+      "mockupFallbackColor": "#f4f4f5",
+      "basePriceCents": 2200
+    },
+    {
+      "id": "8cf5377f-8c6b-4afe-80c3-9337e6303176",
+      "slug": "l",
+      "label": "Large",
+      "physical": {
+        "width": 12,
+        "height": 16,
+        "unit": "in"
+      },
+      "canvas": {
+        "width": 1200,
+        "height": 1600
+      },
+      "printZone": {
+        "x": 120,
+        "y": 160,
+        "width": 960,
+        "height": 1280
+      },
+      "silhouettePath": "M48,0 L1152,0 A48,48 0 0 1 1200,48 L1200,1552 A48,48 0 0 1 1152,1600 L48,1600 A48,48 0 0 1 0,1552 L0,48 A48,48 0 0 1 48,0 Z",
+      "mockupFallbackColor": "#f4f4f5",
+      "basePriceCents": 2200
+    },
+    {
+      "id": "ecc7707a-1703-4c27-9da7-6b39709837ba",
+      "slug": "xl",
+      "label": "X-Large",
+      "physical": {
+        "width": 12,
+        "height": 16,
+        "unit": "in"
+      },
+      "canvas": {
+        "width": 1200,
+        "height": 1600
+      },
+      "printZone": {
+        "x": 120,
+        "y": 160,
+        "width": 960,
+        "height": 1280
+      },
+      "silhouettePath": "M48,0 L1152,0 A48,48 0 0 1 1200,48 L1200,1552 A48,48 0 0 1 1152,1600 L48,1600 A48,48 0 0 1 0,1552 L0,48 A48,48 0 0 1 48,0 Z",
+      "mockupFallbackColor": "#f4f4f5",
+      "basePriceCents": 2400
+    },
+    {
+      "id": "3667ec33-6123-44bd-a12e-5fdfef3c2874",
+      "slug": "xxl",
+      "label": "XX-Large",
+      "physical": {
+        "width": 12,
+        "height": 16,
+        "unit": "in"
+      },
+      "canvas": {
+        "width": 1200,
+        "height": 1600
+      },
+      "printZone": {
+        "x": 120,
+        "y": 160,
+        "width": 960,
+        "height": 1280
+      },
+      "silhouettePath": "M48,0 L1152,0 A48,48 0 0 1 1200,48 L1200,1552 A48,48 0 0 1 1152,1600 L48,1600 A48,48 0 0 1 0,1552 L0,48 A48,48 0 0 1 48,0 Z",
+      "mockupFallbackColor": "#f4f4f5",
+      "basePriceCents": 2600
+    }
+  ],
+  "createdAt": "2026-05-25T12:31:21.547Z",
+  "updatedAt": "2026-05-25T12:31:21.547Z"
+}