支持项目编码访问单项目公示屏

需求：无需查询公示 Token，直接通过项目编码打开单项目公示页。

实现：规范化项目编码并按 code 查询，同时保留既有 Token 哈希查询；补充前后端及集成回归测试。

server/internal/httpapi/public_test.go

@@ -58,6 +58,26 @@ func TestPublicDisplayProjectViewOnlySerializesDisplayFields(t *testing.T) {
 	}
 }
 
+func TestNormalizeDisplayProjectCode(t *testing.T) {
+	tests := []struct {
+		input string
+		want  string
+		ok    bool
+	}{
+		{input: "raft", want: "RAFT", ok: true},
+		{input: " east-ride ", want: "EAST-RIDE", ok: true},
+		{input: "A", ok: false},
+		{input: "bad code", ok: false},
+		{input: strings.Repeat("a", 40), ok: false},
+	}
+	for _, test := range tests {
+		got, ok := normalizeDisplayProjectCode(test.input)
+		if got != test.want || ok != test.ok {
+			t.Fatalf("normalizeDisplayProjectCode(%q) = %q, %v; want %q, %v", test.input, got, ok, test.want, test.ok)
+		}
+	}
+}
+
 func TestPublicPhoneLookupIsDisabledInProduction(t *testing.T) {
 	server := &Server{config: config.Config{Environment: "production"}}
 	recorder := httptest.NewRecorder()