fix(console): deduplicate models and engines in vehicle navigation

Models and engines tables have many duplicate names (e.g. 24 ASTRA rows,
210 F-150 rows, 398 "5.7L 350CID V8" rows). Changed get_models() and
get_engines() to use GROUP BY UPPER(name) instead of DISTINCT on id+name
so each model/engine appears only once in the navigation lists.

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

console/db.py

@@ -67,16 +67,17 @@ class Database:
         if brand:
             return self._query(
                 """
-                SELECT DISTINCT m.id, m.name
+                SELECT MIN(m.id) AS id, m.name
                 FROM models m
                 JOIN brands b ON m.brand_id = b.id
                 WHERE UPPER(b.name) = UPPER(?)
+                GROUP BY UPPER(m.name)
                 ORDER BY m.name
                 """,
                 (brand,),
             )
         return self._query(
-            "SELECT id, name FROM models ORDER BY name"
+            "SELECT MIN(id) AS id, name FROM models GROUP BY UPPER(name) ORDER BY name"
         )
 
     def get_years(
@@ -109,8 +110,13 @@ class Database:
     ) -> list[dict]:
         """Return engines, optionally filtered by brand/model/year."""
         sql = """
-            SELECT DISTINCT e.id, e.name, e.displacement_cc, e.cylinders,
-                   e.fuel_type, e.power_hp, e.torque_nm, e.engine_code
+            SELECT MIN(e.id) AS id, e.name,
+                   MAX(e.displacement_cc) AS displacement_cc,
+                   MAX(e.cylinders) AS cylinders,
+                   MAX(e.fuel_type) AS fuel_type,
+                   MAX(e.power_hp) AS power_hp,
+                   MAX(e.torque_nm) AS torque_nm,
+                   MAX(e.engine_code) AS engine_code
             FROM engines e
             JOIN model_year_engine mye ON e.id = mye.engine_id
             JOIN models m ON mye.model_id = m.id
@@ -128,7 +134,7 @@ class Database:
         if year:
             sql += " AND y.year = ?"
             params.append(int(year))
-        sql += " ORDER BY e.name"
+        sql += " GROUP BY UPPER(e.name) ORDER BY e.name"
         return self._query(sql, tuple(params))
 
     def get_model_year_engine(