feat(tournaments): add partnership tracking and tournament management

Implement comprehensive partnership tracking system and tournament
management features including round-robin, single/double elimination,
and Swiss system pairings.

Changes:
- Add partnership_games and partnership_stats tables
- Implement PartnershipTracker service for recording partnership data
- Add tournament generator with multiple formats
- Create tournament management actions and views
- Add acceptance tests for partnership tracking
- Fix PartnershipTracker to use single snapshot per player per match
- Fix round-robin test to query by round_number instead of hardcoded ID

Note: All 8 acceptance tests now passing

app/templates/admin/tournaments/teams/edit.html.erb

@@ -0,0 +1,39 @@
+<h1>Edit Team: <%= team.team_name %></h1>
+
+<p><strong>Tournament:</strong> <%= tournament.name %></p>
+
+<form action="/admin/tournaments/<%= tournament.id %>/teams/<%= team.id %>" method="post">
+  <input type="hidden" name="_csrf_token" value="<%= csrf_token %>">
+  <input type="hidden" name="_method" value="patch">
+
+  <div>
+    <label for="team_name">Team Name</label>
+    <input type="text" id="team_name" name="team_name" value="<%= team.team_name %>" required>
+  </div>
+
+  <div>
+    <label for="player_1_id">Player 1</label>
+    <select id="player_1_id" name="player_1_id" required>
+      <% players.each do |player| %>
+        <option value="<%= player.id %>" <%= 'selected' if player.id == team.player_1_id %>>
+          <%= player.name %>
+        </option>
+      <% end %>
+    </select>
+  </div>
+
+  <div>
+    <label for="player_2_id">Player 2</label>
+    <select id="player_2_id" name="player_2_id" required>
+      <% players.each do |player| %>
+        <option value="<%= player.id %>" <%= 'selected' if player.id == team.player_2_id %>>
+          <%= player.name %>
+        </option>
+      <% end %>
+    </select>
+  </div>
+
+  <button type="submit">Update Team</button>
+</form>
+
+<p><a href="/admin/tournaments/<%= tournament.id %>">Back to Tournament</a></p>