Seed AI prompt for CV matching in cvMatcher InitialSchema migration

Added seeding of the ai.cv-match.system-prompt to the AiPrompts table. This prompt is retrieved by CvMatcherService when scoring CV-job pairs with the LLM. The {{languageName}} placeholder is substituted at runtime based on the requested language.

The prompt has a fallback in the service code, but seeding it ensures the proper version is used and avoids relying on the hardcoded fallback.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Apis/cv-matcher-data/Migrations/20260601133028_InitialSchema.cs

@@ -70,6 +70,18 @@ namespace CvMatcher.Data.Migrations
                 table: "Results",
                 columns: new[] { "CvDocumentId", "JobDocumentId", "Language" },
                 unique: true);
+
+            // Seed AI prompts for CV matching
+            migrationBuilder.Sql($$"""
+                INSERT INTO [cvMatcher].AiPrompts ([Key], [Language], [Value], [Description])
+                VALUES
+                    ('ai.cv-match.system-prompt', '*',
+                     'You are a strict CV-to-job matching engine. Return JSON only. Score realistically from 0 to 100.
+Penalize missing required skills. Do not invent experience. Use concise business language.
+Respond entirely in {{languageName}} — all text fields in the JSON must be in {{languageName}}.
+JSON shape: {""score"":number,""summary"":""..."",""strengths"":[""...""],""gaps"":[""...""],""recommendations"":[""...""],""evidence"":[""...""]}',
+                     'System prompt template for the CV-to-job LLM matching call. {{languageName}} is substituted at runtime.');
+                """);
         }
 
         /// <inheritdoc />