Initial import into Gitea

GoogleApi/Models/AudienceModels.cs

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+namespace GoogleApi.Models;
+
+/// <summary>
+/// Represents an audience segment from Google Ads (affinity, in-market, life events, etc.)
+/// </summary>
+public class AudienceSegment
+{
+    public long Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string Type { get; set; } = string.Empty;  // AFFINITY, IN_MARKET, LIFE_EVENT, DETAILED_DEMOGRAPHIC
+    public string? ParentName { get; set; }
+    public int? ParentId { get; set; }
+}
+
+/// <summary>
+/// Response containing all available audience segments
+/// </summary>
+public class AudienceSegmentsResponse
+{
+    public List<AudienceSegment> Affinity { get; set; } = new();
+    public List<AudienceSegment> InMarket { get; set; } = new();
+    public List<AudienceSegment> LifeEvents { get; set; } = new();
+    public List<AudienceSegment> DetailedDemographics { get; set; } = new();
+    public int TotalCount => Affinity.Count + InMarket.Count + LifeEvents.Count + DetailedDemographics.Count;
+    public DateTimeOffset RetrievedAt { get; set; } = DateTimeOffset.UtcNow;
+}
+
+/// <summary>
+/// Geo target constant for location targeting
+/// </summary>
+public class GeoTarget
+{
+    public long Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string CanonicalName { get; set; } = string.Empty;
+    public string TargetType { get; set; } = string.Empty;  // City, State, Country, etc.
+    public string? CountryCode { get; set; }
+    public string? ParentGeoTarget { get; set; }
+}
+
+/// <summary>
+/// Response for geo target search
+/// </summary>
+public class GeoTargetSearchResponse
+{
+    public List<GeoTarget> Results { get; set; } = new();
+    public string Query { get; set; } = string.Empty;
+}
+
+/// <summary>
+/// Payload for searching geo targets
+/// </summary>
+public class GeoTargetSearchPayload
+{
+    public string Query { get; set; } = string.Empty;
+    public string? CountryCode { get; set; }
+    public int MaxResults { get; set; } = 20;
+}