feat: optimize ag and apt snippet collections

AG (The Silver Searcher):
- Remove old snippets (5 removed)
- Add comprehensive search commands (38 added)
- Cover: search modes, output formats, file types, filters

APT (Debian/Ubuntu package manager):
- Remove old snippets (10 removed)
- Add comprehensive package commands (36 added)
- Cover: update/upgrade, install/remove, search, sources, dependencies

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

Alfred.alfredpreferences/snippets/ag/ag -w 關鍵字 [C5D6E7F8-2A9B-1C2D-3E4F-5A6B7C8D9E0F].json

@@ -0,0 +1,8 @@
+{
+  "alfredsnippet" : {
+    "snippet" : "ag -w \"\"",
+    "uid" : "C5D6E7F8-2A9B-1C2D-3E4F-5A6B7C8D9E0F",
+    "name" : "只符合完整單字",
+    "keyword" : ""
+  }
+}