feat: add support for patching icedos modules

[IceDBorn]

Add support for patching icedos modules and expose module input patching to users.

Module patching (renames celluloid input name):

--- a/modules/celluloid/icedos.nix
+++ b/modules/celluloid/icedos.nix
@@ -10,7 +10,7 @@
 in
 {
   inputs = {
-    celluloid-shader = {
+    celluloid-shader-repopatched = {
       url = "path://${toFile shaderFileName shader}";
       flake = false;
     };
@@ -33,7 +33,7 @@
 
               {
                 xdg.configFile."celluloid/celluloid.conf".source = ./celluloid.conf;
-                xdg.configFile."celluloid/shaders/FSR.glsl".source = inputs.celluloid-shader;
+                xdg.configFile."celluloid/shaders/FSR.glsl".source = inputs.celluloid-shader-repopatched;
 
                 dconf.settings = {
                   "io/github/celluloid-player/celluloid" = {

[[icedos.repositories]]
url = "github:icedos/apps"
patches = ["celluloid-rename.patch"]
modules = [ "celluloid" ]

Module input patching (adds a file to the prefixer input flake):

--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ b/ICEDOS_CONSUMER_INPUT_PATCH	2026-06-03 00:00:00.000000000 +0000
@@ -0,0 +1 @@
+prefixer input patched from config (no fork)

[[icedos.repositories.inputPatches]]
module = "prefixer"
input = "prefixer"
patches = ["prefixer-consumer.patch"]

Paths are relative to the config root. So, these patches should be next to config.toml. You can specify any relative path you want, for example, "patches/patch.patch", as long as it exists under config root.

[IceDBorn]

Any reviewers? @CrazyStevenz @jim3692

[IceDBorn]

Tests to be done:

• Ensure all configs working from config root
• Ensure flake input patches work from module root's path