feat: integrate Career Workspace foundation from feature/career-workspace

Recover the F1 Career Profile foundation + AI-workspace persistence from the
unmerged feature/career-workspace branch, so Phase 2 builds on the documented,
tested target state instead of re-deriving it. Foundation only — CV Builder
commits (variants, ATS badge, rewrite diff) stay deferred per "do not build CV
Builder yet". See docs/career-workspace-branch-assessment.md.

Squashed from 3 branch commits (235e291, 5916f09, 00a035e), resolved against
main + Phase 0:

- CareerProfile + CareerProfileVersion (append-only history), dual-written from
  every profile save path via CareerProfileService. ApplicationUser.
  ProfileCvStructureJson stays authoritative; the tables mirror it. Stable item
  IDs assigned to jobs/education/certifications/projects (the prerequisite for
  future variant lineage). CvDateNormalizer for free-text -> YYYY-MM.
- InterviewPrepNote + AiWorkspaceNote: cache AI interview prep / candidate fit /
  focus plan keyed by an attachment-context signature, so they stop regenerating
  (and re-spending the provider) on every open.

Conflict resolutions (union, favouring current code + Phase 0):
- JobTrackerContext / StartupInitializationExtensions: kept Phase 0's tables and
  reconciler blocks, added the career/interview/ai-note tables (both SQLite and
  MySQL dialects).
- ProfileCvController: dropped the branch's in-file DTO records (main defines them
  in ProfileCvDtos.cs) and the LayoutFamily/AtsRating template fields (deferred
  ATS-badge work), keeping main's 7-arg CvTemplateDescriptor.
- JobApplicationsController: kept the branch's cache-check, restored main's
  AsNoTracking on the read-only user load.

Tables ship empty (verified dev); nothing to migrate.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

JobTrackerApi/Controllers/ProfileCvController.cs

@@ -71,8 +71,9 @@ public sealed class ProfileCvController : ControllerBase
     private readonly ICvPdfExporter _cvPdfExporter;
     private readonly ICvProcessingQueue _cvProcessingQueue;
     private readonly IAppEmailSender _emailSender;
+    private readonly ICareerProfileService _careerProfileService;
 
-    public ProfileCvController(UserManager<ApplicationUser> users, ISummarizerService aiService, JobTrackerContext db, AppPaths paths, ILogger<ProfileCvController>? logger = null, ICvAiClassifier? cvAiClassifier = null, ICvAiNormalizer? cvAiNormalizer = null, ICvTemplateRenderer? cvTemplateRenderer = null, ICvPdfExporter? cvPdfExporter = null, ICvProcessingQueue? cvProcessingQueue = null, IAppEmailSender? emailSender = null)
+    public ProfileCvController(UserManager<ApplicationUser> users, ISummarizerService aiService, JobTrackerContext db, AppPaths paths, ILogger<ProfileCvController>? logger = null, ICvAiClassifier? cvAiClassifier = null, ICvAiNormalizer? cvAiNormalizer = null, ICvTemplateRenderer? cvTemplateRenderer = null, ICvPdfExporter? cvPdfExporter = null, ICvProcessingQueue? cvProcessingQueue = null, IAppEmailSender? emailSender = null, ICareerProfileService? careerProfileService = null)
     {
         _users = users;
         _aiService = aiService;
@@ -85,6 +86,7 @@ public sealed class ProfileCvController : ControllerBase
         _cvPdfExporter = cvPdfExporter ?? new ThrowingCvPdfExporter();
         _cvProcessingQueue = cvProcessingQueue ?? NoOpCvProcessingQueue.Instance;
         _emailSender = emailSender ?? NoOpEmailSender.Instance;
+        _careerProfileService = careerProfileService ?? new CareerProfileService(db);
     }
 
     private sealed class NoOpEmailSender : IAppEmailSender
@@ -113,6 +115,11 @@ public sealed class ProfileCvController : ControllerBase
         public string? Tone { get; set; }
         public string? Language { get; set; }
     }
+    // ParseCvRequest / CvTemplateDescriptor / ProfileCvPreviewDto / CvRewriteFailureDto are
+    // defined in ProfileCvDtos.cs on main (extracted after this branch forked). The branch's
+    // in-file copies are dropped here to avoid duplicate definitions. The LayoutFamily/AtsRating
+    // fields the branch added to CvTemplateDescriptor belong to the deferred ATS-badge work
+    // (Phase 4), not this foundation integration.
     private sealed record ExtractionPipelineResult(string RawText, string NormalizedText, StructuredCvProfile StructuredCv);
     private sealed record ClassifiedCvBlock(int Index, string OriginalBlock, string SectionName, string Content, CvBlockClassificationResult? Classification);
 
@@ -155,6 +162,7 @@ public sealed class ProfileCvController : ControllerBase
             result.StructuredCv.Metadata.ProfileVersion = (user.CurrentCvProfileVersion ?? 0) + 1;
             result.StructuredCv.Metadata.AppliedExtractionRunId = run.Id;
             result.StructuredCv.Metadata.UpdatedAtUtc = DateTimeOffset.UtcNow;
+            await _careerProfileService.SaveVersionAsync(user.Id, result.StructuredCv, "upload", HttpContext.RequestAborted);
             var structuredJson = StructuredCvProfileJson.Serialize(result.StructuredCv);
 
             run.RawExtractedText = result.RawText;
@@ -553,6 +561,8 @@ public sealed class ProfileCvController : ControllerBase
 
     private static IReadOnlyList<CvTemplateDescriptor> GetCvTemplateDescriptors()
     {
+        // 7-arg shape matches CvTemplateDescriptor in ProfileCvDtos.cs. The LayoutFamily/AtsRating
+        // fields the branch added here are deferred with the rest of the ATS-badge work (Phase 4).
         return new[]
         {
             new CvTemplateDescriptor("ats-minimal", "ATS Minimal", "Scanner-friendly", "slate", "Compact, direct, and easy to parse.", "Best for broad application flows and recruiter scanning.", new List<string> { "Tight hierarchy", "Keyword-friendly", "Low visual risk" }),
@@ -825,6 +835,7 @@ public sealed class ProfileCvController : ControllerBase
         structuredCv.Metadata.ProfileVersion = (user.CurrentCvProfileVersion ?? 0) + 1;
         structuredCv.Metadata.AppliedExtractionRunId = run.Id;
         structuredCv.Metadata.UpdatedAtUtc = DateTimeOffset.UtcNow;
+        await _careerProfileService.SaveVersionAsync(user.Id, structuredCv, trigger, cancellationToken);
         var structuredJson = StructuredCvProfileJson.Serialize(structuredCv);
         run.StructuredProfileJson = structuredJson;
 
@@ -965,6 +976,7 @@ public sealed class ProfileCvController : ControllerBase
         structuredCv.Metadata.ProfileVersion = (user.CurrentCvProfileVersion ?? 0) + 1;
         structuredCv.Metadata.AppliedExtractionRunId = run.Id;
         structuredCv.Metadata.UpdatedAtUtc = DateTimeOffset.UtcNow;
+        await _careerProfileService.SaveVersionAsync(user.Id, structuredCv, run.Trigger, cancellationToken);
         var structuredJson = StructuredCvProfileJson.Serialize(structuredCv);
 
         run.RawExtractedText = rawText;