Enable editing alliance names in tournament setup

[Copilot]

Alliance names were hardcoded as "Alliance 1", "Alliance 2", etc. during tournament participant setup. This prevents organizers from using meaningful names like "Red Alliance" or custom identifiers.

Changes

Modified /apps/web/src/apps/schedules/tournaments/round-robin.tsx:

• Added input fields for editing allianceNameLong and allianceNameShort alongside each alliance header
• Persist existing alliance names when loading saved alliances
• Default to numbered names ("Alliance X", "#X") when creating new alliances

UI

<Row gutter={[8, 8]} align="middle">
  <Col>
    <Typography.Title level={4}>Alliance {i + 1}</Typography.Title>
  </Col>
  <Col flex="auto">
    <Input 
      placeholder="Alliance Name (e.g., Alliance 1)"
      value={allianceNames[i]?.long || ''}
      onChange={(e) => updateAllianceName(i, 'long', e.target.value)}
    />
  </Col>
  <Col>
    <Input 
      placeholder="Short (e.g., #1)"
      value={allianceNames[i]?.short || ''}
      onChange={(e) => updateAllianceName(i, 'short', e.target.value)}
    />
  </Col>
</Row>

Custom names are stored in the existing allianceNameLong and allianceNameShort fields when saving alliances.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>allow for editing alliance names/numbers in tournemtns</issue_title>
<issue_description></issue_description>

<agent_instructions>fix this</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes allow for editing alliance names/numbers in tournemtns #222

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