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/apt/apt depends [B0C1D2E3-7F4A-6B7C-8D9E-0F1A2B3C4D5E].json

@@ -0,0 +1,8 @@
+{
+  "alfredsnippet" : {
+    "snippet" : "apt depends ",
+    "uid" : "B0C1D2E3-7F4A-6B7C-8D9E-0F1A2B3C4D5E",
+    "name" : "顯示套件相依性",
+    "keyword" : ""
+  }
+}