feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/Core/StorageQuotaEvictionPlannerGateTests.cs

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+using System;
+using System.Collections.Generic;
+using Paca.Mobile.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class StorageQuotaEvictionPlannerGateTests
+{
+    [Fact]
+    public void Gate437_StorageQuotaEvictionPlanner_CalculatesRequiredSpace_Correctly()
+    {
+        // 5GB free, 8GB requested, 1GB headroom -> 4GB deficit
+        long deficit = StorageQuotaEvictionPlanner.CalculateDeficit(
+            freeSpaceBytes: 5L * 1024 * 1024 * 1024,
+            requestedBytes: 8L * 1024 * 1024 * 1024,
+            headroomBytes: 1L * 1024 * 1024 * 1024
+        );
+        Assert.Equal(4L * 1024 * 1024 * 1024, deficit);
+
+        // 10GB free, 8GB requested, 1GB headroom -> 0 deficit
+        long noDeficit = StorageQuotaEvictionPlanner.CalculateDeficit(
+            freeSpaceBytes: 10L * 1024 * 1024 * 1024,
+            requestedBytes: 8L * 1024 * 1024 * 1024,
+            headroomBytes: 1L * 1024 * 1024 * 1024
+        );
+        Assert.Equal(0, noDeficit);
+    }
+
+    [Fact]
+    public void Gate438_StorageQuotaEvictionPlanner_EvictsByLru_WhilePreservingPinned()
+    {
+        var now = DateTime.UtcNow;
+        var candidates = new List<EvictionCandidate>
+        {
+            new("file1.mp4", 1000, now.AddDays(-10), IsPinned: true), // pinned!
+            new("file2.mp4", 1000, now.AddDays(-5), IsPinned: false),
+            new("file3.mp4", 1000, now.AddDays(-20), IsPinned: false), // oldest unpinned!
+            new("file4.mp4", 1000, now.AddDays(-1), IsPinned: false)
+        };
+
+        var plan = StorageQuotaEvictionPlanner.PlanEviction(candidates, deficitBytes: 1500, EvictionStrategy.LRU);
+
+        Assert.True(plan.IsSatisfiable);
+        Assert.Equal(2, plan.FilesToEvict.Count);
+        Assert.Equal("file3.mp4", plan.FilesToEvict[0].FilePath); // oldest
+        Assert.Equal("file2.mp4", plan.FilesToEvict[1].FilePath); // second oldest
+        Assert.DoesNotContain(plan.FilesToEvict, f => f.FilePath == "file1.mp4"); // preserved!
+    }
+
+    [Fact]
+    public void Gate439_StorageQuotaEvictionPlanner_EvictsByLargestFirst()
+    {
+        var now = DateTime.UtcNow;
+        var candidates = new List<EvictionCandidate>
+        {
+            new("small.mp4", 500, now, false),
+            new("huge.mp4", 3000, now, false),
+            new("medium.mp4", 1000, now, false)
+        };
+
+        var plan = StorageQuotaEvictionPlanner.PlanEviction(candidates, deficitBytes: 2500, EvictionStrategy.LargestFirst);
+
+        Assert.True(plan.IsSatisfiable);
+        Assert.Single(plan.FilesToEvict);
+        Assert.Equal("huge.mp4", plan.FilesToEvict[0].FilePath);
+        Assert.Equal(3000, plan.TotalFreedBytes);
+    }
+
+    [Fact]
+    public void Gate440_StorageQuotaEvictionPlanner_DeterminesFeasibility()
+    {
+        var now = DateTime.UtcNow;
+        var candidates = new List<EvictionCandidate>
+        {
+            new("file1.mp4", 1000, now, false)
+        };
+
+        var plan = StorageQuotaEvictionPlanner.PlanEviction(candidates, deficitBytes: 5000, EvictionStrategy.LRU);
+
+        Assert.False(plan.IsSatisfiable);
+        Assert.Equal(1000, plan.TotalFreedBytes);
+    }
+}