Show addon dependencies in tooltip

Add display of required and optional addon dependencies to the addons tooltip. Introduce AddDependencyLines helper in modules/addons.lua which lists dependencies with color coding: green for loaded, yellow for present but unloaded, and red for missing (uses new T["Missing"]). Store dependency arrays on addon frames (adeps / aoptdeps) using GetAddOnDependencies and C_AddOns.GetAddOnOptionalDependencies. Add translation keys 'Dependencies', 'Optional Dependencies', and 'Missing' to env/translations_enUS.lua.

env/translations_enUS.lua

@@ -195,6 +195,7 @@ pfUI_translation["enUS"] = {
   ["Deficit"] = nil,
   ["Delete profile"] = nil,
   ["Delete / Reset"] = nil,
+  ["Dependencies"] = nil,
   ["Descending"] = nil,
   ["Description Font"] = nil,
   ["Description Font Size"] = nil,
@@ -499,6 +500,7 @@ pfUI_translation["enUS"] = {
   ["Menu Font Size"] = nil,
   ["Messages are no longer forwarded to:"] = nil,
   ["Middle Mouse Button"] = nil,
+  ["Missing"] = nil,
   ["Minimap"] = nil,
   ["Minimap Panel"] = nil,
   ["Minimap Size (|cffffaaaaExperimental|r)"] = nil,
@@ -552,6 +554,7 @@ pfUI_translation["enUS"] = {
   ["Only Show Own Debuffs (|cffffaaaaExperimental|r)"] = nil,
   ["Only Show Target Castbar"] = nil,
   ["On State Change"] = nil,
+  ["Optional Dependencies"] = nil,
   ["Options"] = nil,
   ["Orientation"] = nil,
   ["Other Panel: Minimap"] = nil,