refactor: restructure solution into -models/-data/-api project taxonomy

Phases 1-10 of the planned refactoring:

Phase 1: rename shared-models -> common
  - namespace Shared.Models -> Common throughout
  - remove stale AspNetCore.Http.Features 5.0 reference

Phase 2: create shared-data with abstract BaseEntity
  - BaseEntity: required string Id { get; init; } + DateTime CreatedAt { get; init; }

Phase 3: rename myai-models -> myai-data
  - namespace MyAi.Models -> MyAi.Data
  - MigrationsAssembly("myai-data")

Phase 4: rename cv-search-models -> cv-search-data
  - namespace CvSearch.Models -> CvSearch.Data
  - move JobSearchSettings to cv-matcher-api-models
  - JobSearch*Entity now inherits BaseEntity

Phase 5: extract rag-data from rag-api
  - new project: Apis/rag-data with RagDbContext + entities + migrations
  - RagDocumentEntity inherits BaseEntity; cache entities use CacheKey PK
  - fix duplicate AddHttpClient<RagAiClient>/AddScoped registrations in rag-api
  - MigrationsAssembly("rag-data")

Phase 6: extract cv-matcher-data from cv-matcher-api
  - new project: Apis/cv-matcher-data with CvMatcherDbContext + entities + migrations
  - CvMatchResultEntity inherits BaseEntity; CvMatcherChatCacheEntity uses CacheKey PK
  - MigrationsAssembly("cv-matcher-data")

Phase 7: create empty cv-cleanup-job-models and cv-search-job-models

Phase 8: update all 5 Dockerfiles for renamed/new projects

Phase 9: reorganise .sln virtual folders (Apis/Jobs/Models/Data/Helpers)
  - update root CLAUDE.md with new project taxonomy and migration commands
  - update cv-matcher-api/CLAUDE.md and cv-search-job/CLAUDE.md

Phase 10: add Directory.Packages.props for centralised NuGet versions
  - remove Version= from all PackageReference elements in active .csproj files

No database changes. No runtime behaviour changes.
All MigrationId strings in __EFMigrationsHistory are unaffected.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Apis/cv-matcher-api/Program.cs

@@ -2,20 +2,19 @@ using Api.Clients.Ai;
 using Api.Clients.Ai.Contracts;
 using Api.Clients.Api;
 using Api.Clients.Api.Contracts;
-using Api.Data;
-using Api.Data.Repositories;
-using Api.Data.Repositories.Contracts;
+using CvMatcher.Data;
+using CvMatcher.Data.Repositories;
+using CvMatcher.Data.Repositories.Contracts;
 using Api.Services;
 using Api.Services.Contracts;
 using CvMatcher.Models.Settings;
-using CvSearch.Models.Data;
-using CvSearch.Models.Settings;
+using CvSearch.Data;
 using Microsoft.EntityFrameworkCore;
-using MyAi.Models.Data;
-using MyAi.Models.Services;
+using MyAi.Data;
+using MyAi.Data.Services;
 using Refit;
 using Serilog;
-using Shared.Models.Settings;
+using Common.Settings;
 using StartupHelpers;
 using System.Reflection;
 
@@ -63,6 +62,7 @@ try
         options.UseSqlServer(connectionString, sql =>
         {
             sql.MigrationsHistoryTable(CvMatcherDbContext.MigrationTableName, CvMatcherDbContext.SchemaName);
+            sql.MigrationsAssembly("cv-matcher-data");
         });
     });
 
@@ -71,7 +71,7 @@ try
         var connectionString = builder.Services.GetConfiguredDbConnectionString(builder.Configuration);
         options.UseSqlServer(connectionString, sql =>
         {
-            sql.MigrationsAssembly("cv-search-models");
+            sql.MigrationsAssembly("cv-search-data");
             sql.MigrationsHistoryTable(CvSearchDbContext.MigrationTableName, CvSearchDbContext.SchemaName);
         });
     });
@@ -81,7 +81,7 @@ try
         var connectionString = builder.Services.GetConfiguredDbConnectionString(builder.Configuration);
         options.UseSqlServer(connectionString, sql =>
         {
-            sql.MigrationsAssembly("myai-models");
+            sql.MigrationsAssembly("myai-data");
             sql.MigrationsHistoryTable(MyAiDbContext.MigrationTableName, MyAiDbContext.SchemaName);
         });
     });