feat(configurations)!: flatten down, introduce meta.nix

Flatten down directory structure:
- From: `./hosts/${configuration-type}/${system}/{configuration,deploy}.nix`
-   To: `./hosts/${configuration-type}/{meta,configuration}.nix`
Keep `system` and `deploy-rs` config in `meta.nix`
Update `flake.lock`

hosts/nixos/jeeves/ollama.nix

@@ -0,0 +1,30 @@
+{ inputs, lib, pkgs, config, ... }:
+{
+  networking.firewall.allowedTCPPorts = [11434];
+
+  services.ollama = {
+    enable = true;
+    host = "0.0.0.0";
+    port = 11434;
+    acceleration = "rocm";
+    environmentVariables = {
+      OLLAMA_ORIGINS = "*";
+    };
+  };
+
+  services.open-webui = {
+    enable = true;
+    host = "0.0.0.0";
+    port = 3000;
+    environment = {
+      ANONYMIZED_TELEMETRY = "False";
+      DO_NOT_TRACK = "True";
+      SCARF_NO_ANALYTICS = "True";
+      TRANSFORMERS_CACHE = "${config.services.open-webui.stateDir}/cache";
+      OLLAMA_API_BASE_URL = "http://127.0.0.1:11434";
+      # Disable authentication
+      WEBUI_AUTH = "False";
+    };
+    openFirewall = true;
+  };
+}