Rework Makefile with install/link/update targets and auto-generation

Add gen-update-targets.sh to parse flake.nix and generate grouped
update targets (update-kyle, update-mc). Makefile now has install
(copy) and link (symlink) targets for rebuild-nixos. Also fix mc
flake input URLs to use /mc/ org path.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

flake.lock

@@ -164,17 +164,17 @@
         ]
       },
       "locked": {
-        "lastModified": 1774588158,
-        "narHash": "sha256-CM0CyFJ/XtxZWDKtBSgf6thY4/NZR72y8Muy4SD9oAk=",
+        "lastModified": 1774593162,
+        "narHash": "sha256-jYcIAwdULM2O06rNerW3PGp+cOQKlvk2DjmgnmDxzP8=",
         "ref": "refs/heads/master",
-        "rev": "dc1816b159cc5095b8ddd7c3f942626243c0878b",
-        "revCount": 27,
+        "rev": "a45ed03432096f04b0fb6fd410e76a61223f4228",
+        "revCount": 28,
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mc-proxy"
+        "url": "https://git@git.wntrmute.dev/mc/mc-proxy"
       },
       "original": {
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mc-proxy"
+        "url": "https://git@git.wntrmute.dev/mc/mc-proxy"
       }
     },
     "mcdeploy": {
@@ -190,11 +190,11 @@
         "rev": "9c016e54ecbc3546b189af935f27ca0ad461c14f",
         "revCount": 4,
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mcdeploy"
+        "url": "https://git@git.wntrmute.dev/mc/mcdeploy"
       },
       "original": {
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mcdeploy"
+        "url": "https://git@git.wntrmute.dev/mc/mcdeploy"
       }
     },
     "mcias": {
@@ -208,11 +208,11 @@
         "rev": "9b521f3d999e8950c2268c2240c490f8509db60f",
         "revCount": 95,
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mcias.git"
+        "url": "https://git@git.wntrmute.dev/mc/mcias.git"
       },
       "original": {
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mcias.git"
+        "url": "https://git@git.wntrmute.dev/mc/mcias.git"
       }
     },
     "mcp": {
@@ -222,11 +222,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1774590396,
-        "narHash": "sha256-FyQNU//OHqjsU7wqJt5iosxwjbQafpmTORNyq7k+t+I=",
+        "lastModified": 1774595952,
+        "narHash": "sha256-AlivqmqpRuCav0Eu7sEpGDg0pxMeC7rNVewxelHSKZI=",
         "ref": "refs/heads/master",
-        "rev": "e18a3647bfbc1a8a452133f8617bec6105776485",
-        "revCount": 22,
+        "rev": "503c52dc269ca834b8b38d1a242ed48971ee17cb",
+        "revCount": 24,
         "type": "git",
         "url": "https://git@git.wntrmute.dev/mc/mcp"
       },
@@ -242,17 +242,17 @@
         ]
       },
       "locked": {
-        "lastModified": 1774588281,
-        "narHash": "sha256-OAncdSzGgH7zcRaBwBSQMc8ofVMNrNlsnMwMounARa4=",
+        "lastModified": 1774593062,
+        "narHash": "sha256-Mwt4+JkGUyFiwjnLMJGrAA/n9950c3X/waV3DiUB3d4=",
         "ref": "refs/heads/master",
-        "rev": "3d36c58d0d672745f34301515ca568466bfb37a6",
-        "revCount": 24,
+        "rev": "acc4851549a01642952314e03e4d8d91002f8824",
+        "revCount": 26,
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mcr"
+        "url": "https://git@git.wntrmute.dev/mc/mcr"
       },
       "original": {
         "type": "git",
-        "url": "https://git@git.wntrmute.dev/kyle/mcr"
+        "url": "https://git@git.wntrmute.dev/mc/mcr"
       }
     },
     "nix-index-database": {
@@ -365,11 +365,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1774551446,
-        "narHash": "sha256-dnX6zMTp4jqbcjlD5qenBYftE/OvHpqKugGLLKj1/bg=",
+        "lastModified": 1774596342,
+        "narHash": "sha256-FlUcJydnZmj0l7a08z+viSQEwtvnNFggJqlECMHfUBY=",
         "owner": "kisom",
         "repo": "sgard",
-        "rev": "b9b9082008424b7610ef6d7cf2bbcb47d1ea697d",
+        "rev": "de5759ac77a2aadc43d48e52e3f53551b3353659",
         "type": "github"
       },
       "original": {