Fix openclaw config syntax - use external json file

- Move openclaw config to separate json file
- Reference file directly in podman module
- Remove problematic builtins.toJSON with nested arrays

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

configuration.nix

@@ -104,52 +104,4 @@
       ZAI_API_KEY=${config.sops.placeholder.openclaw_zai_api_key}
     '';
   };
-
-  sops.templates."openclaw_config.json" = {
-    content = builtins.toJSON {
-      gateway = {
-        port = 18789;
-        bind = "0.0.0.0";
-        trustedProxies = ["::1", "127.0.0.1", "10.88.0.0/16", "10.89.0.0/16"];
-        auth = {
-          mode = "none";
-        };
-        controlUi = {
-          dangerouslyAllowHostHeaderOriginFallback = true;
-          allowedOrigins = ["*"];
-        };
-      };
-      channels = {
-        discord = {
-          enabled = true;
-          groupPolicy = "open";
-          dmPolicy = "open";
-          allowFrom = ["*"];
-        };
-      };
-      agents = {
-        defaults = {
-          model = {
-            primary = "zai/glm-5";
-          };
-        };
-      };
-      models = {
-        providers = {
-          zai = {
-            baseUrl = "https://api.z.ai/api/coding/paas/v4";
-            apiKey = "\${ZAI_API_KEY}";
-            api = "openai-completions";
-            models = [
-              { id = "glm-4.7"; name = "GLM 4.7"; contextWindow = 128000; maxTokens = 131072; }
-              { id = "glm-5"; name = "GLM 5"; contextWindow = 128000; maxTokens = 131072; }
-              { id = "glm-5-turbo"; name = "GLM 5 Turbo"; contextWindow = 128000; maxTokens = 131072; }
-              { id = "glm-4.5-air"; name = "GLM 4.5 Air"; contextWindow = 128000; maxTokens = 131072; }
-              { id = "glm-4.7-flash"; name = "GLM 4.7 Flash"; contextWindow = 128000; maxTokens = 131072; }
-            ];
-          };
-        };
-      };
-    };
-  };
 }