docs: Add EA legal compliance documentation

Documented EA's requirements for community servers:
- ⚖️ NO real money in-app purchases (PROHIBITED)
- ⚖️ NO charging for APK distribution (PROHIBITED)
- ✅ Donations for server upkeep are allowed
- ✅ All in-game content must be FREE

Added EA-LEGAL-AGREEMENT.md covering:
- Official EA policy (allowed vs prohibited)
- Server implementation requirements
- Donation guidelines and transparency
- Code examples for free economy
- Compliance checklist
- Disclaimers and legal notices

Updated RewardsController.cs:
- Added EA compliance comments to gold purchase endpoint
- Reinforced that Price MUST be 0
- Clear documentation that no real transactions allowed

This ensures the community server complies with EA's generous
allowance of community servers for this discontinued game.

RR3CommunityServer/Controllers/RewardsController.cs

@@ -114,10 +114,14 @@ public class RewardsController : ControllerBase
     /// <summary>
     /// Purchase gold with real money (free in community server)
     /// </summary>
+    /// <summary>
+    /// Purchase gold - FREE in community server per EA agreement
+    /// IMPORTANT: No real money transactions allowed!
+    /// </summary>
     [HttpPost("gold/purchase")]
     public async Task<IActionResult> PurchaseGold([FromBody] GoldPurchaseRequest request)
     {
-        _logger.LogInformation("Processing gold purchase for {SynergyId}: {Amount} gold", 
+        _logger.LogInformation("Processing gold purchase for {SynergyId}: {Amount} gold (FREE - community server)", 
             request.SynergyId, request.GoldAmount);
 
         var user = await _context.Users.FirstOrDefaultAsync(u => u.SynergyId == request.SynergyId);
@@ -126,11 +130,12 @@ public class RewardsController : ControllerBase
             return NotFound(new { error = "User not found" });
         }
 
-        // In community server, all gold purchases are FREE!
+        // ⚖️ EA COMPLIANCE: All gold purchases are FREE in community server!
+        // Per EA agreement: No real money in-app purchases allowed
         if (user.Gold == null) user.Gold = 0;
         user.Gold += request.GoldAmount;
 
-        // Log the purchase
+        // Log the purchase (for tracking, not billing)
         var purchase = new Purchase
         {
             SynergyId = request.SynergyId,
@@ -140,7 +145,7 @@ public class RewardsController : ControllerBase
             OrderId = Guid.NewGuid().ToString(),
             PurchaseTime = DateTime.UtcNow,
             Token = Guid.NewGuid().ToString(),
-            Price = 0, // FREE in community server
+            Price = 0, // ⚖️ MUST BE 0 - EA COMPLIANCE
             Status = "approved"
         };