fix(data/smartphone,scripts): drop duplicate honor-magic-7-pro and guard against future slug collisions

The seed/dump loaders fail on `UNIQUE constraint failed: smartphones.slug`
because two records share `slug=honor-magic-7-pro` - a 2024-10-30 China
launch and a 2025-01-08 global launch. Keep the earlier `verified: true`
record under data/smartphone/honor/2024/ and remove the duplicate.

Also harden `scripts/validate.py` with `_check_unique_slugs` so a future
duplicate is caught before the seed step blows up CI (Test + Pages
+ refresh-data workflows all hit the same error on 985007d).

Refs #1

Author: Seungpyo1007

data/smartphone/honor/2025/honor-magic-7-pro.json

@@ -110,6 +110,23 @@ def _check_date(name: str, value: object, errors: list[str]) -> None:
         errors.append(f"{name}: release_date '{value}' must be ISO 8601 YYYY-MM-DD (§14.2)")
 
 
+def _check_unique_slugs(
+    category: str, records: list[tuple[str, dict[str, Any]]], errors: list[str]
+) -> None:
+    """Each category's `slug` must be unique — seed/dump load into a UNIQUE column."""
+    seen: dict[str, str] = {}
+    for fname, rec in records:
+        slug = rec.get("slug")
+        if not isinstance(slug, str):
+            continue
+        if slug in seen:
+            errors.append(
+                f"{fname}: duplicate {category} slug '{slug}' (also in {seen[slug]})"
+            )
+        else:
+            seen[slug] = fname
+
+
 def validate() -> list[str]:
     errors: list[str] = []
 
@@ -122,6 +139,15 @@ def validate() -> list[str]:
     brand_slugs = {rec["slug"] for _, rec in brands if "slug" in rec}
     soc_slugs = {rec["slug"] for _, rec in socs if "slug" in rec}
 
+    for category, records in (
+        ("brand", brands),
+        ("soc", socs),
+        ("smartphone", phones),
+        ("gpu", gpus),
+        ("cpu", cpus),
+    ):
+        _check_unique_slugs(category, records, errors)
+
     for fname, rec in brands:
         _check_required(fname, rec, BRAND_REQUIRED, errors)
         _check_slug(fname, rec.get("slug"), errors)