refactor(server): unify instance httpapi middleware routing

Unify declared instance HTTP API endpoints under typed middleware routing, including event streaming and PTY WebSocket connect handling.\n\nPreserve PTY connect compatibility by checking missing PTYs before parsing optional cursor and ticket query fields, with regression coverage.

packages/opencode/test/server/httpapi-public-openapi.test.ts

@@ -9,6 +9,7 @@ type OpenApiResponse = {
   readonly content?: Record<string, { readonly schema?: OpenApiSchema }>
 }
 type OpenApiOperation = {
+  readonly parameters?: ReadonlyArray<{ readonly name: string; readonly in: string }>
   readonly responses?: Record<string, OpenApiResponse>
   readonly security?: unknown
 }
@@ -207,6 +208,11 @@ describe("PublicApi OpenAPI v2 errors", () => {
     expect(componentName(responseRef(spec.paths["/pty/{ptyID}/connect-token"]?.post?.responses?.["403"]) ?? "")).toBe(
       "PtyForbiddenError",
     )
+    expect(
+      spec.paths["/pty/{ptyID}/connect"]?.get?.parameters
+        ?.filter((parameter) => parameter.in === "query")
+        .map((parameter) => parameter.name),
+    ).toEqual(["directory", "workspace", "cursor", "ticket"])
   })
 
   test("documents project not-found errors", () => {