refactor: moved nixos modules to dendrite pattern

modules/nixos/programs/actual/proxy.nix

@@ -0,0 +1,36 @@
+{...}: {
+  flake.nixosModules.actual-proxy = {
+    lib,
+    config,
+    ...
+  }: {
+    options.services.actual = {
+      domain = lib.mkOption {
+        type = lib.types.str;
+        description = "domain that actual will be hosted at";
+        default = "actual.arpa";
+      };
+      extraDomains = lib.mkOption {
+        type = lib.types.listOf lib.types.str;
+        description = "extra domains that should be configured for actual";
+        default = [];
+      };
+      reverseProxy.enable = lib.mkOption {
+        type = lib.types.bool;
+        default = config.services.actual.enable && config.services.reverseProxy.enable;
+      };
+    };
+
+    config = lib.mkIf config.services.actual.reverseProxy.enable {
+      services.reverseProxy.services.actual = {
+        target = "http://localhost:${toString config.services.actual.settings.port}";
+        domain = config.services.actual.domain;
+        extraDomains = config.services.actual.extraDomains;
+
+        settings = {
+          forwardHeaders.enable = true;
+        };
+      };
+    };
+  };
+}