feat(companies): add recruiter relationship history

JobTrackerApi/Controllers/CompaniesController.cs

@@ -76,6 +76,31 @@ namespace JobTrackerApi.Controllers
             return Ok(company);
         }
 
+        public sealed record CompanyApplicationRelationshipDto(int Id, string JobTitle, string Status, DateTime? DateApplied, DateTime? FollowUpAt, int MessageCount, DateTime? LastContactAt);
+        public sealed record CompanyContactDto(int Id, int JobApplicationId, string JobTitle, DateTime Date, string? Direction, string? Channel, string? Subject, string From);
+        public sealed record CompanyRelationshipDto(Company Company, IReadOnlyList<CompanyApplicationRelationshipDto> Applications, IReadOnlyList<CompanyContactDto> RecentContacts);
+
+        [HttpGet("{id:int}/relationship")]
+        public async Task<ActionResult<CompanyRelationshipDto>> GetRelationship([FromRoute] int id, CancellationToken cancellationToken)
+        {
+            var userId = CurrentUserId;
+            if (string.IsNullOrWhiteSpace(userId)) return Unauthorized();
+            var company = await _db.Companies.AsNoTracking().FirstOrDefaultAsync(c => c.Id == id && c.OwnerUserId == userId, cancellationToken);
+            if (company is null) return NotFound();
+
+            var applications = await _db.JobApplications.AsNoTracking().Include(a => a.Messages)
+                .Where(a => a.OwnerUserId == userId && a.CompanyId == id && !a.IsDeleted)
+                .OrderByDescending(a => a.DateApplied ?? a.SavedAt)
+                .ToListAsync(cancellationToken);
+            var applicationRows = applications.Select(a => new CompanyApplicationRelationshipDto(
+                a.Id, a.JobTitle, a.Status, a.DateApplied, a.FollowUpAt, a.Messages.Count,
+                a.Messages.Count == 0 ? null : a.Messages.Max(m => (DateTime?)m.Date))).ToList();
+            var contacts = applications.SelectMany(a => a.Messages.Select(m => new CompanyContactDto(
+                    m.Id, a.Id, a.JobTitle, m.Date, m.Direction, m.Channel, m.Subject, m.From)))
+                .OrderByDescending(m => m.Date).Take(20).ToList();
+            return Ok(new CompanyRelationshipDto(company, applicationRows, contacts));
+        }
+
         public sealed record CreateCompanyRequest(string Name, string? Location, string? Source);
         public sealed record UpdateCompanyRequest(
             string Name,