Add metadata field to SearchAndGeocodeTool schema

The Mapbox Search Box API can return metadata (including primary_photo
and Japanese reading information) for various feature types in forward
geocoding results. Currently, SearchAndGeocodeTool.output.schema.ts
doesn't include a metadata field, which could lead to validation errors
when the API returns this data.

This fix adds the metadata field with the same structure used in
CategorySearchTool (fixed in PR #77):
- primary_photo: Accepts both string and array of strings
- reading: Optional Japanese reading information (ja_kana, ja_latin)

This prevents validation failures when the API returns metadata fields.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: mattpodwysocki

src/tools/search-and-geocode-tool/SearchAndGeocodeTool.output.schema.ts

@@ -100,6 +100,20 @@ const SearchBoxFeaturePropertiesSchema = z
     brand_id: z.union([z.string(), z.array(z.string())]).optional(),
     external_ids: z.record(z.string()).optional(),
 
+    // Metadata schema for additional feature information
+    metadata: z
+      .object({
+        // API sometimes returns string, sometimes array - accept both
+        primary_photo: z.union([z.string(), z.array(z.string())]).optional(),
+        reading: z
+          .object({
+            ja_kana: z.string().optional(),
+            ja_latin: z.string().optional()
+          })
+          .optional()
+      })
+      .optional(),
+
     // Additional metadata
     maki: z.string().optional(),
     operational_status: z.string().optional(),