feat: enhance DoH profile management and resolver policy in modules

- Added `DohResolverPolicy` schema to OpenAPI documentation, defining policies for domain resolution.
- Updated module handling to support multiple DoH profiles via `doh_profile_ids` and introduced `doh_resolver_policy` in the API.
- Refactored related functions to accommodate the new DoH profile structure, ensuring backward compatibility with existing `doh_profile_id`.
- Enhanced UI components to allow selection and management of DoH profiles and policies in the web interface.
- Updated database interactions to handle new fields and ensure proper data normalization.

internal/store/doh_module_test.go

@@ -0,0 +1,32 @@
+package store
+
+import "testing"
+
+func TestNormalizeDohProfileIDList(t *testing.T) {
+	got := NormalizeDohProfileIDList([]string{" a ", "b", "a", "", "b"})
+	if len(got) != 2 || got[0] != "a" || got[1] != "b" {
+		t.Fatalf("unexpected: %v", got)
+	}
+}
+
+func TestApplyModuleDohPatch(t *testing.T) {
+	mod := &Module{DohProfileIDs: []string{"one"}, DohResolverPolicy: DohPolicyPrimaryOnly}
+	ids := []string{"ru", "eu"}
+	policy := DohPolicyUnion
+	ApplyModuleDohPatch(mod, &ModulePatch{DohProfileIDs: &ids, DohResolverPolicy: &policy})
+	if len(mod.DohProfileIDs) != 2 || mod.DohResolverPolicy != DohPolicyUnion {
+		t.Fatalf("unexpected module doh fields: %+v", mod)
+	}
+	if mod.DohProfileID == nil || *mod.DohProfileID != "ru" {
+		t.Fatalf("legacy id not synced: %+v", mod.DohProfileID)
+	}
+}
+
+func TestEffectiveDohProfileIDs_LegacyField(t *testing.T) {
+	id := "legacy-id"
+	mod := &Module{DohProfileID: &id}
+	got := mod.EffectiveDohProfileIDs()
+	if len(got) != 1 || got[0] != "legacy-id" {
+		t.Fatalf("unexpected: %v", got)
+	}
+}