feat(backend): restructure API into layers with OpenAPI, versioning and error handling

Split the backend into API host, Domain, Application and Infrastructure projects. Add Swagger/OpenAPI per API version, Asp.Versioning (query/header), ProblemDetails with a global exception handler and SurrealQL migrations applied at startup (namespace/database ensured). Infrastructure owns the SurrealDB client, settings and DI.

backend/Domain/Enums/ApplicationStatus.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum ApplicationStatus
+{
+    Draft,
+    Submitted,
+    Accepted,
+    Rejected,
+}

backend/Domain/Enums/DocumentScope.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum DocumentScope
+{
+    Local,
+    Partial,
+    Full,
+    Anonymized,
+}

backend/Domain/Enums/GrantCallStatus.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum GrantCallStatus
+{
+    Planned,
+    Open,
+    Closed,
+}

backend/Domain/Enums/IdeaStatus.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum IdeaStatus
+{
+    Draft,
+    Submitted,
+    InReview,
+    Accepted,
+    Rejected,
+}

backend/Domain/Enums/InnovationStage.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum InnovationStage
+{
+    Idea,
+    Pilot,
+    Scaling,
+    Service,
+}

backend/Domain/Enums/LocationKind.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum LocationKind
+{
+    Gmina,
+    Powiat,
+    Wojewodztwo,
+}

backend/Domain/Enums/PartnershipStatus.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum PartnershipStatus
+{
+    Proposed,
+    Active,
+    Closed,
+}

backend/Domain/Enums/SubmissionStatus.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum SubmissionStatus
+{
+    New,
+    Triaged,
+    Matched,
+    InProgress,
+    Closed,
+    Rejected,
+}

backend/Domain/Enums/TagGroup.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum TagGroup
+{
+    Audience,
+    Topic,
+    Stage,
+    Sector,
+    Cross,
+}

backend/Domain/Enums/UserRole.cs

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+namespace TarninaHub.Domain.Enums;
+
+public enum UserRole
+{
+    User,
+    Jst,
+    Operator,
+    Manager,
+    Admin,
+}

backend/Domain/TarninaHub.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>