fix(server): retain deprecated jonMode/dynamicPrompt in schema for existing documents

Existing production streamJobs documents contain these fields. Convex
schema validation rejects documents with extra fields, so they must
remain in the schema until a migration removes them from all documents.

Author: leoisadev1

apps/server/convex/schema.ts

@@ -262,6 +262,9 @@ export default defineSchema({
 			enableWebSearch: v.optional(v.boolean()),
 			supportsToolCalls: v.optional(v.boolean()),
 			maxSteps: v.optional(v.number()),
+			// Deprecated: retained in schema for backward compatibility with existing documents
+			dynamicPrompt: v.optional(v.boolean()),
+			jonMode: v.optional(v.boolean()),
 		})),
 		content: v.string(),
 		reasoning: v.optional(v.string()),