chore: update flake inputs and adjust configs

- Update flake inputs (home-manager, HyprPanel, nixpkgs variants, NUR, AGENTS)
- Switch OpenCode agents to opencode/ model provider
- Remove webcord package from media config
- Fix thunar plugins namespace (xfce.* → pkgs.*)
- Upgrade m3-kratos kernel to 6.18
- Disable ADB and qdrant service on m3-kratos
- Enable qdrant overlay using stable nixpkgs

home/features/coding/opencode.nix

@@ -79,7 +79,7 @@
     "$schema" = "https://raw.githubusercontent.com/code-yeongyu/oh-my-opencode/master/assets/oh-my-opencode.schema.json";
     agents = {
       Sisyphus = {
-        model = "anthropic/claude-opus-4-5";
+        model = "opencode/claude-opus-4-5";
         permission = {
           edit = "allow";
           bash = {
@@ -139,7 +139,7 @@
         };
       };
       librarian = {
-        model = "anthropic/claude-sonnet-4-5";
+        model = "opencode/claude-sonnet-4-5";
         permission = {
           edit = "deny";
           bash = "deny";
@@ -153,14 +153,14 @@
         };
       };
       oracle = {
-        model = "anthropic/claude-sonnet-4-5";
+        model = "opencode/claude-sonnet-4-5";
         permission = {
           edit = "deny";
           bash = "deny";
         };
       };
       frontend-ui-ux-engineer = {
-        model = "anthropic/claude-opus-4-5";
+        model = "opencode/claude-opus-4-5";
         permission = {
           edit = "allow";
           bash = {
@@ -180,14 +180,14 @@
         };
       };
       document-writer = {
-        model = "anthropic/claude-opus-4-5";
+        model = "opencode/claude-opus-4-5";
         permission = {
           edit = "allow";
           bash = "deny";
         };
       };
       multimodal-looker = {
-        model = "anthropic/claude-opus-4-5";
+        model = "opencode/claude-opus-4-5";
         permission = {
           edit = "deny";
           bash = "deny";