feat: templates per ticket type

Each ticket type can carry a starting description and a checklist, edited
in the project settings. New tickets of that type get the description
when they come without one and always get the checklist; the new ticket
form says what the template will add.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/openapi.json

@@ -9051,6 +9051,25 @@
           "support"
         ]
       },
+      "IssueTemplateDto": {
+        "type": "object",
+        "properties": {
+          "description": {
+            "type": "string",
+            "nullable": true
+          },
+          "checklist": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          }
+        },
+        "required": [
+          "description",
+          "checklist"
+        ]
+      },
       "IssueTypeOptionDto": {
         "type": "object",
         "properties": {
@@ -9078,6 +9097,14 @@
           },
           "archived": {
             "type": "boolean"
+          },
+          "template": {
+            "description": "What a new ticket of the type starts with",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/IssueTemplateDto"
+              }
+            ]
           }
         },
         "required": [
@@ -9352,6 +9379,23 @@
           "to"
         ]
       },
+      "IssueTemplateBodyDto": {
+        "type": "object",
+        "properties": {
+          "description": {
+            "type": "string",
+            "nullable": true,
+            "maxLength": 5000
+          },
+          "checklist": {
+            "maxItems": 20,
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          }
+        }
+      },
       "IssueTypeOptionBodyDto": {
         "type": "object",
         "properties": {
@@ -9381,6 +9425,16 @@
           "archived": {
             "type": "boolean",
             "default": false
+          },
+          "template": {
+            "nullable": true,
+            "description": "What a new ticket of the type starts with",
+            "type": "object",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/IssueTemplateBodyDto"
+              }
+            ]
           }
         },
         "required": [

apps/api/schema.gql

@@ -491,12 +491,27 @@ enum IssueSort {
   RECENT
 }
 
+"""What a new ticket of the type starts with"""
+type IssueTemplate {
+  """Steps added to every new ticket"""
+  checklist: [String!]!
+
+  """Used when the ticket comes without a description"""
+  description: String
+}
+
+input IssueTemplateInput {
+  checklist: [String!]! = []
+  description: String
+}
+
 type IssueTypeOption {
   archived: Boolean!
   color: String!
   icon: String!
   id: String!
   name: String!
+  template: IssueTemplate
 }
 
 input IssueTypeOptionInput {
@@ -505,6 +520,7 @@ input IssueTypeOptionInput {
   icon: String!
   id: String!
   name: String!
+  template: IssueTemplateInput
 }
 
 enum LinkDirection {