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-pty.test.ts

@@ -147,6 +147,14 @@ describe("pty HttpApi bridge", () => {
     expect(response.status).toBe(404)
   })
 
+  test("returns 404 for missing PTY websocket before decoding cursor query", async () => {
+    await using tmp = await tmpdir({ git: true, config: { formatter: false, lsp: false } })
+    const response = await app().request(`${PtyPaths.connect.replace(":ptyID", PtyID.ascending())}?cursor=a&cursor=b`, {
+      headers: { "x-opencode-directory": tmp.path },
+    })
+    expect(response.status).toBe(404)
+  })
+
   test("returns typed not found errors for missing PTY HTTP resources", async () => {
     await using tmp = await tmpdir({ git: true, config: { formatter: false, lsp: false } })
     const headers = { "x-opencode-directory": tmp.path }