chore(opencode): update to v1.1.51 and refactor build configuration

- Update opencode from v1.1.48 to v1.1.51
- Refactor build dependencies: remove fzf, add sysctl conditionally for Darwin
- Fix bun to use nixpkgs-unstable input instead of direct dependency
- Add platform-specific outputHash for Darwin and Linux
- Move wrapProgram from postFixup to installPhase
- Remove unnecessary build patch and postPatch/postBuild workarounds
- Fix config path to use absolute home directory
- Add git and home-manager to default shell inputs
- Minor README documentation reordering

modules/home/programs/terminal/opencode/default.nix

@@ -41,7 +41,7 @@ in
         sopsFile = lib.snowfall.fs.get-file "secrets/common/evanreichard.yaml";
       };
       templates."opencode.json" = {
-        path = ".config/opencode/opencode.json";
+        path = "${config.home.homeDirectory}/.config/opencode/opencode.json";
         content = builtins.toJSON {
           "$schema" = "https://opencode.ai/config.json";
           theme = "catppuccin";