chore: replace "manager role" with "administrator role" (#11395)

# Which Problems Are Solved

As part of the naming consistency initiative, the term `Manager Roles`
is replaced by `Administrator Roles`

# How the Problems Are Solved

By replacing `Manager Roles` with `Administrator Roles` in API docs,
Console UI, and guides.

# Additional Changes
N/A

# Additional Context
- Closes https://github.com/zitadel/zitadel/issues/11293

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

(cherry picked from commit d7cec1d3bd)

API_DESIGN.md

@@ -206,7 +206,7 @@ In this case, the settings could share the same `SettingsContext` message to det
 But do not create a global `Context` message that is used across the whole API if there are different scenarios and different fields required for the context.  
 The same applies to messages that are returned by multiple resources.  
 For example, information about the `User` might be different when managing the user resource itself than when it's returned
-as part of an authorization or a manager role, where only limited information is needed.
+as part of an authorization or an administrator role, where only limited information is needed.
 
 On the other hand, types that always follow the same pattern and are used in multiple resources, such as `IDFilter`, `TimestampFilter` or `InIDsFilter` SHOULD be globalized and reused.
 

proto/zitadel/auth.proto

@@ -908,7 +908,7 @@ service AuthService {
         option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
             tags: "User Authorizations/Grants"
             summary: "List My ZITADEL Permissions";
-            description: "Returns a list of permissions the authenticated user has in ZITADEL based on the manager roles the user has. (e.g: ORG_OWNER = org.read, org.write, ...)."
+            description: "Returns a list of permissions the authenticated user has in ZITADEL based on the administrator roles the user has. (e.g: ORG_OWNER = org.read, org.write, ...)."
         };
     }
 
@@ -944,7 +944,7 @@ service AuthService {
 
         option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
             tags: "User Memberships"
-            summary: "List My ZITADEL Manager Roles";
+            summary: "List My ZITADEL Administrator Roles";
             description: "Show all the management roles my user has in ZITADEL (ZITADEL Manager)."
         };
     }