feat(api): 内部面 token 按调用方拆分为 velocity/limbo/build/ops 并按路由限定调用方，审计来源区分调用方，安装器生成并下发各自 Secret，新增 felis rotate-token 轮换命令

cmd/felis/api_tokens_test.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"felis.lolicon.best/internal/api"
+)
+
+// felis-api maps each env var onto the caller the Deployment feeds it for, so the
+// build Job's token (FELIS_BUILD_TOKEN) authenticates as build and only as build.
+func TestInternalCallerTokensReadEachCallersEnv(t *testing.T) {
+	env := map[string]string{
+		"FELIS_SERVICE_TOKEN": "v-tok",
+		"FELIS_LIMBO_TOKEN":   "l-tok",
+		"FELIS_BUILD_TOKEN":   " b-tok\n",
+		"FELIS_OPS_TOKEN":     "o-tok",
+	}
+	auth, err := internalCallerTokens(func(k string) string { return env[k] })
+	if err != nil {
+		t.Fatal(err)
+	}
+	for tok, want := range map[string]api.Caller{"v-tok": api.CallerVelocity, "l-tok": api.CallerLimbo, "b-tok": api.CallerBuild, "o-tok": api.CallerOps} {
+		r := httptest.NewRequest("GET", "/", nil)
+		r.Header.Set("Authorization", "Bearer "+tok)
+		if got, err := auth.Authenticate(r); err != nil || got != want {
+			t.Errorf("%s: got (%q, %v), want %q", tok, got, err, want)
+		}
+	}
+
+	// An install where the build namespace still holds a copy of the proxy's token
+	// would let that copy act as the proxy; the api refuses to start on it.
+	env["FELIS_BUILD_TOKEN"] = "v-tok"
+	if _, err := internalCallerTokens(func(k string) string { return env[k] }); err == nil || !strings.Contains(err.Error(), "same value") {
+		t.Fatalf("shared token: err = %v, want a same-value refusal", err)
+	}
+}