test(e2e): add bypass module e2e test suite

Verify both blacklist and whitelist bypass modes: a matching destination
skips the dead chain node and connects directly to the echo server, while a
non-matching destination is forced through the dead node and never reaches it.

tests/e2e/testdata/bypass/blacklist.yaml

@@ -0,0 +1,29 @@
+# Forward proxy whose only chain node is dead (127.0.0.1:18082). A blacklist
+# bypass matching the destination skips that node and connects directly to the
+# echo server; a non-matching destination is forced through the dead node.
+services:
+  - name: proxy
+    addr: ":8080"
+    handler:
+      type: http
+      chain: my-chain
+    listener:
+      type: tcp
+
+chains:
+  - name: my-chain
+    hops:
+      - name: hop-0
+        nodes:
+          - name: node-0
+            addr: 127.0.0.1:18082
+            bypass: bypass-0
+            connector:
+              type: http
+            dialer:
+              type: tcp
+
+bypasses:
+  - name: bypass-0
+    matchers:
+      - "{{.ServerAddr}}"