feat: implement AI custom tag proposals

- AI now suggests dominant notes not in the system list (Part 3: Custom Suggestions)
- Updated TagSelector to show 'Neu anlegen?' buttons for AI-proposed custom tags
- Added suggested_custom_tags to bottles table and metadata schema
- Updated TastingNoteForm to handle both system and custom AI suggestions

src/services/save-bottle.ts

@@ -67,6 +67,8 @@ export async function saveBottle(
                 distilled_at: metadata.distilled_at,
                 bottled_at: metadata.bottled_at,
                 batch_info: metadata.batch_info,
+                suggested_tags: metadata.suggested_tags,
+                suggested_custom_tags: metadata.suggested_custom_tags,
             })
             .select()
             .single();