feat(sub): add dynamic remark variables with Jalali date, transport, and status tokens (#5430)

* feat(sub): implement dynamic single-bracket remark variables with timezone-aware inline Jalali conversion

* Update .gitignore

* Update .gitignore

* merge: bring in origin/main commits to resolve conflict base

* fix(sub): address review issues in dynamic remark variables

- Add TIME_LEFT to unlimitedDropTokens so segments containing only
  {TIME_LEFT} are dropped for unlimited clients (same as DAYS_LEFT)
- Remove dead uiSingleBraceRe variable (translateUISingleBrackets uses
  a character scanner, not this regex)
- Change expireDateLabel to use time.Local instead of UTC, consistent
  with jalaliExpireDateLabel

Co-authored-by: Sanaei <MHSanaei@users.noreply.github.com>

* fix

* fix

---------

Co-authored-by: MHSanaei <MHSanaei@users.noreply.github.com>

frontend/public/openapi.json

@@ -222,6 +222,10 @@
             "description": "Encrypt subscription responses",
             "type": "boolean"
           },
+          "subHideSettings": {
+            "description": "Hide server settings in happ subscription (Only for Happ)",
+            "type": "boolean"
+          },
           "subJsonEnable": {
             "description": "Enable JSON subscription endpoint",
             "type": "boolean"
@@ -439,6 +443,7 @@
           "subEnable",
           "subEnableRouting",
           "subEncrypt",
+          "subHideSettings",
           "subJsonEnable",
           "subJsonFinalMask",
           "subJsonMux",
@@ -698,6 +703,10 @@
             "description": "Encrypt subscription responses",
             "type": "boolean"
           },
+          "subHideSettings": {
+            "description": "Hide server settings in happ subscription (Only for Happ)",
+            "type": "boolean"
+          },
           "subJsonEnable": {
             "description": "Enable JSON subscription endpoint",
             "type": "boolean"
@@ -922,6 +931,7 @@
           "subEnable",
           "subEnableRouting",
           "subEncrypt",
+          "subHideSettings",
           "subJsonEnable",
           "subJsonFinalMask",
           "subJsonMux",