Add type annotations to CI operators; clarify suffix comment

Co-authored-by: xperiandri <2365592+xperiandri@users.noreply.github.com>

Author: Copilot

src/FSharp.Data.GraphQL.Server.Middleware/ObjectListFilter.fs

@@ -132,10 +132,10 @@ module ObjectListFilter =
         let ( ===~ ) fname (value : string) = Equals ({ FieldName = fname; Value = value }, StringComparer.OrdinalIgnoreCase)
 
         /// Creates a new ObjectListFilter representing a case-insensitive STARTS WITH operation on a string value.
-        let ( =@@~ ) fname value = StartsWith ({ FieldName = fname; Value = value }, StringComparer.OrdinalIgnoreCase)
+        let ( =@@~ ) fname (value : string) = StartsWith ({ FieldName = fname; Value = value }, StringComparer.OrdinalIgnoreCase)
 
         /// Creates a new ObjectListFilter representing a case-insensitive ENDS WITH operation on a string value.
-        let ( @@=~ ) fname value = EndsWith ({ FieldName = fname; Value = value }, StringComparer.OrdinalIgnoreCase)
+        let ( @@=~ ) fname (value : string) = EndsWith ({ FieldName = fname; Value = value }, StringComparer.OrdinalIgnoreCase)
 
         /// Creates a new ObjectListFilter representing a case-insensitive CONTAINS operation on a string value.
         let ( @=@~ ) fname (value : string) = Contains ({ FieldName = fname; Value = value }, StringComparer.OrdinalIgnoreCase)

src/FSharp.Data.GraphQL.Server.Middleware/SchemaDefinitions.fs

@@ -21,8 +21,8 @@ type private ComparisonOperator =
     | In of string
 
 // String filter suffixes:
-//   lowercase  → case-insensitive (OrdinalIgnoreCase)
-//   Capitalized / UPPER → case-sensitive (Ordinal)
+//   lowercase (e.g. _ends_with, _ew)   → case-insensitive (OrdinalIgnoreCase)
+//   Capitalized (e.g. _Ends_With, _EW) → case-sensitive (Ordinal)
 [<Literal>]
 let private endsWithSuffix = "_ends_with"