Fix OpenAPI PdfOptions schema: add missing format values, waitUntil field, and template size limits

- Updated format enum from 6 to 11 values: added Ledger, A0, A1, A2, A6
- Added waitUntil field with enum: [load, domcontentloaded, networkidle0, networkidle2]
- Added 100KB size limit documentation for headerTemplate and footerTemplate
- Added comprehensive test to verify OpenAPI spec matches validation logic
- All tests passing (463/463)

src/swagger.ts

@@ -47,7 +47,7 @@ const options: swaggerJsdoc.Options = {
           properties: {
             format: {
               type: "string",
-              enum: ["A4", "Letter", "Legal", "A3", "A5", "Tabloid"],
+              enum: ["Letter", "Legal", "Tabloid", "Ledger", "A0", "A1", "A2", "A3", "A4", "A5", "A6"],
               default: "A4",
               description: "Page size. Ignored if width/height are set.",
             },
@@ -76,13 +76,18 @@ const options: swaggerJsdoc.Options = {
               default: "document.pdf",
               description: "Suggested filename for the PDF download",
             },
+            waitUntil: {
+              type: "string",
+              enum: ["load", "domcontentloaded", "networkidle0", "networkidle2"],
+              description: "Wait condition for page rendering before PDF generation.",
+            },
             headerTemplate: {
               type: "string",
-              description: "HTML template for the page header. Requires displayHeaderFooter: true. Use these CSS classes for dynamic values: date, title, url, pageNumber, totalPages. Example: '<span class=\"pageNumber\"></span> / <span class=\"totalPages\"></span>'",
+              description: "HTML template for the page header. Requires displayHeaderFooter: true. Use these CSS classes for dynamic values: date, title, url, pageNumber, totalPages. Maximum size: 100KB. Example: '<span class=\"pageNumber\"></span> / <span class=\"totalPages\"></span>'",
             },
             footerTemplate: {
               type: "string",
-              description: "HTML template for the page footer. Requires displayHeaderFooter: true. Supports the same CSS classes as headerTemplate.",
+              description: "HTML template for the page footer. Requires displayHeaderFooter: true. Supports the same CSS classes as headerTemplate. Maximum size: 100KB.",
             },
             displayHeaderFooter: {
               type: "boolean",