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/__tests__/api.test.ts

@@ -626,6 +626,26 @@ describe("OpenAPI spec", () => {
     expect(paths).toContain("/v1/convert/markdown");
     expect(paths).toContain("/health");
   });
+
+  it("PdfOptions schema includes all valid format values and waitUntil field", async () => {
+    const res = await fetch(`${BASE}/openapi.json`);
+    const spec = await res.json();
+    
+    const pdfOptions = spec.components.schemas.PdfOptions;
+    expect(pdfOptions).toBeDefined();
+    
+    // Check that all 11 format values are included
+    const expectedFormats = ["Letter", "Legal", "Tabloid", "Ledger", "A0", "A1", "A2", "A3", "A4", "A5", "A6"];
+    expect(pdfOptions.properties.format.enum).toEqual(expectedFormats);
+    
+    // Check that waitUntil field exists with correct enum values
+    expect(pdfOptions.properties.waitUntil).toBeDefined();
+    expect(pdfOptions.properties.waitUntil.enum).toEqual(["load", "domcontentloaded", "networkidle0", "networkidle2"]);
+    
+    // Check that headerTemplate and footerTemplate descriptions mention 100KB limit
+    expect(pdfOptions.properties.headerTemplate.description).toContain("100KB");
+    expect(pdfOptions.properties.footerTemplate.description).toContain("100KB");
+  });
 });
 
 describe("404 handler", () => {