feat: implement club admin dashboard with activity feed and settings

e2e/cucumber/features/admin-dashboard.feature

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+Feature: Club Admin Dashboard
+  As a club admin
+  I want to view club-wide statistics and manage club operations
+  So that I can effectively oversee the club
+
+  @happy-path @admin @issue-11
+  Scenario: Club admin views dashboard with statistics
+    Given I am logged in as a club admin
+    When I go to the admin dashboard
+    Then I should see "Admin Dashboard"
+    And I should see total player count
+    And I should see active tournament count
+
+  @happy-path @admin @issue-11
+  Scenario: Club admin views recent activity feed
+    Given I am logged in as a club admin
+    And there are recent activities in the system
+    When I go to the admin dashboard
+    Then I should see the activity feed section
+    And I should see recent player registrations
+
+  @happy-path @admin @issue-11
+  Scenario: Club admin searches player directory
+    Given I am logged in as a club admin
+    And there are multiple players in the system
+    When I go to the player management page
+    And I search for "Player 1"
+    Then I should see search results
+
+  @happy-path @admin @issue-11
+  Scenario: Club admin updates club settings
+    Given I am logged in as a club admin
+    When I go to the club settings page
+    And I update the club name
+    And I save the settings
+    Then the settings should be saved successfully