chore(main): 回流 —— opencode Zen 免费层可用 + noVNC path 相对名修复

内容与 release/v2.0.x 完全一致（git checkout release/v2.0.x -- .）：
- feat(opencode): Zen 免费层门禁四要素 + 两个 id 公式（详见 release 提交）
- fix(vnc): noVNC 的 path 必须用相对名，否则 WebSocket 路径重复拼接

internal/lua/adapter_opencodezen_test.go

@@ -0,0 +1,156 @@
+package lua
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+)
+
+// E2E：加载改后的适配器，验证 (1) 头含两个 session 头且值相同；(2) id 段服从公式；
+// (3) 无 tools 的请求被注入 read 桩且 properties 非空。
+func TestOpencodeZenAdapterE2E(t *testing.T) {
+	src, err := bundledAdapters.ReadFile("adapters/opencodezen.lua")
+	if err != nil {
+		t.Fatal(err)
+	}
+	vm := NewVM(t.TempDir())
+	defer vm.Stop()
+	if err := vm.LoadAdapterSource("opencodezen", string(src)); err != nil {
+		t.Fatalf("加载失败: %v", err)
+	}
+
+	t.Run("头：两个 session 头同值", func(t *testing.T) {
+		h, err := vm.BuildHeaders("opencodezen", map[string]interface{}{"timestamp": int64(1792065049)})
+		if err != nil {
+			t.Fatal(err)
+		}
+		s1, s2 := h["x-opencode-session"], h["x-opencode-session-id"]
+		if s1 == "" || s2 == "" {
+			t.Fatalf("两个 session 头都必须存在: %#v", h)
+		}
+		if s1 != s2 {
+			t.Fatalf("必须同值: %q vs %q", s1, s2)
+		}
+		if !strings.HasPrefix(s1, "ses_") || len(s1) != 4+12+14 {
+			t.Fatalf("session 形状应为 ses_+12hex+14base62: %q (len=%d)", s1, len(s1))
+		}
+		if len(h["x-opencode-request"]) != 4+12+14 || !strings.HasPrefix(h["x-opencode-request"], "msg_") {
+			t.Fatalf("request 形状: %q", h["x-opencode-request"])
+		}
+		if !strings.Contains(h["User-Agent"], "opencode/1.19.0") {
+			t.Fatalf("UA 应为 1.19.0: %q", h["User-Agent"])
+		}
+		t.Logf("session=%s request=%s", s1, h["x-opencode-request"])
+		// 公式校验：段 = (K - bucket_ms*4096) & MASK，其中 bucket 已对齐到整分钟
+		// （适配器按分钟桶取会话号，以保留上游前缀缓存命中）。
+		// ⚠️ 判据必须算**同一个桶**，不能拿原始 ms 去比 —— 那会把正确的实现判成错。
+		seg := s1[4:16]
+		ms := int64(1792065049) * 1000
+		bucket := ms - (ms % 60000)
+		want := (int64(0x1afffffffffffe) - bucket*4096) & 0xFFFFFFFFFFFF
+		if got := seg; got != fmtHex12(want) {
+			t.Fatalf("session 段公式不符: got=%s want=%s (bucket=%d)", got, fmtHex12(want), bucket)
+		}
+	})
+
+	t.Run("tools 兜底：无 tools 时注入 read", func(t *testing.T) {
+		out, err := vm.Transform("opencodezen", "transform_request",
+			`{"model":"m","stream":true,"messages":[{"role":"user","content":"hi"}]}`)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var req map[string]interface{}
+		if err := json.Unmarshal([]byte(out), &req); err != nil {
+			t.Fatal(err)
+		}
+		ts, _ := req["tools"].([]interface{})
+		if len(ts) == 0 {
+			t.Fatalf("必须注入 tools: %s", out)
+		}
+		found := false
+		for _, x := range ts {
+			fn := x.(map[string]interface{})["function"].(map[string]interface{})
+			if fn["name"] == "read" {
+				p, _ := fn["parameters"].(map[string]interface{})
+				props, _ := p["properties"].(map[string]interface{})
+				if len(props) == 0 {
+					t.Fatalf("read 的 properties 必须非空（门禁要求）: %s", out)
+				}
+				found = true
+			}
+		}
+		if !found {
+			t.Fatalf("必须含名为 read 的工具: %s", out)
+		}
+	})
+
+	t.Run("tools 保留：用户自带 read 不被覆盖", func(t *testing.T) {
+		in := `{"model":"m","stream":true,"messages":[{"role":"user","content":"hi"}],
+		 "tools":[{"type":"function","function":{"name":"read","description":"MY","parameters":{"type":"object","properties":{"a":{"type":"string"}}}}}]}`
+		out, err := vm.Transform("opencodezen", "transform_request", in)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var req map[string]interface{}
+		json.Unmarshal([]byte(out), &req)
+		ts, _ := req["tools"].([]interface{})
+		if len(ts) != 1 {
+			t.Fatalf("不应追加（已有 read）: %s", out)
+		}
+		fn := ts[0].(map[string]interface{})["function"].(map[string]interface{})
+		if fn["description"] != "MY" {
+			t.Fatalf("用户定义被覆盖: %s", out)
+		}
+	})
+}
+
+func fmtHex12(v int64) string {
+	const hex = "0123456789abcdef"
+	out := make([]byte, 12)
+	for i := 11; i >= 0; i-- {
+		out[i] = hex[v&0xF]
+		v >>= 4
+	}
+	return string(out)
+}
+
+// ★ 免费层只能流式（适配器强制 stream=true），而内核在客户端要非流式时
+// 会调 transform_response（期望 JSON）⇒ 适配器必须能把 SSE 聚合回非流式对象。
+// 这条判据钉住那个聚合：真实 SSE 片段 → 完整 chat.completion。
+func TestOpencodeZenAggregatesSSEForNonStreamClient(t *testing.T) {
+	src, err := bundledAdapters.ReadFile("adapters/opencodezen.lua")
+	if err != nil {
+		t.Fatal(err)
+	}
+	vm := NewVM(t.TempDir())
+	defer vm.Stop()
+	if err := vm.LoadAdapterSource("opencodezen", string(src)); err != nil {
+		t.Fatal(err)
+	}
+	// 模仿上游真实 SSE（含 reasoning_content 与 usage 末帧）
+	sse := `data: {"id":"x1","object":"chat.completion.chunk","created":1,"model":"m","choices":[{"index":0,"delta":{"role":"assistant","content":"","reasoning_content":"think "}}]}
+data: {"id":"x1","object":"chat.completion.chunk","created":1,"model":"m","choices":[{"index":0,"delta":{"content":"HELLO"}}]}
+data: {"id":"x1","object":"chat.completion.chunk","created":1,"model":"m","choices":[{"index":0,"delta":{"content":" WORLD"},"finish_reason":"stop"}]}
+data: {"id":"x1","object":"chat.completion.chunk","created":1,"model":"m","choices":[],"usage":{"prompt_tokens":7,"completion_tokens":2,"total_tokens":9}}
+data: [DONE]
+`
+	out, err := vm.Transform("opencodezen", "transform_response", sse)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var u map[string]interface{}
+	if err := json.Unmarshal([]byte(out), &u); err != nil {
+		t.Fatalf("聚合产物不是 JSON: %v (%s)", err, out)
+	}
+	if u["content"] != "HELLO WORLD" {
+		t.Fatalf("content 应为 'HELLO WORLD'，实得 %v", u["content"])
+	}
+	tu, _ := u["token_usage"].(map[string]interface{})
+	if tu == nil || tu["prompt"] != float64(7) {
+		t.Fatalf("usage 应透传: %v", u["token_usage"])
+	}
+	if u["finish_reason"] != "stop" {
+		t.Fatalf("finish_reason 应为 stop: %v", u["finish_reason"])
+	}
+	t.Logf("聚合 OK: content=%v usage=%v finish=%v", u["content"], tu, u["finish_reason"])
+}