templates: add multi-category filter (repeatable or CSV) to GET /api/templates/search; add has_keywords filter; add categories listing endpoint with counts; update docs; add tests

app/database/schema_updates.py

@@ -93,6 +93,7 @@ def ensure_schema_updates(engine: Engine) -> None:
         "pension_schedules": {
             "vests_on": "DATE",
             "vests_at": "FLOAT",
+            "version": "VARCHAR(10)",
         },
         "marriage_history": {
             "married_from": "DATE",
@@ -102,6 +103,7 @@ def ensure_schema_updates(engine: Engine) -> None:
             "service_to": "DATE",
             "service_years": "FLOAT",
             "marital_percent": "FLOAT",
+            "version": "VARCHAR(10)",
         },
         "death_benefits": {
             "lump1": "FLOAT",
@@ -110,6 +112,10 @@ def ensure_schema_updates(engine: Engine) -> None:
             "growth2": "FLOAT",
             "disc1": "FLOAT",
             "disc2": "FLOAT",
+            "version": "VARCHAR(10)",
+        },
+        "separation_agreements": {
+            "version": "VARCHAR(10)",
         },
     }