feat(wiki): add event item flag and decouple pokemon display ID

Add `is_event_item` to pokemon, items, and habitats.
Separate internal `id` and `display_id` for pokemon to allow event variants.
Update frontend forms and views to support the new fields.

backend/db/schema.sql

@@ -263,7 +263,9 @@ CREATE TABLE IF NOT EXISTS pokemon_types (
 
 CREATE TABLE IF NOT EXISTS pokemon (
   id integer PRIMARY KEY,
+  display_id integer NOT NULL CHECK (display_id > 0),
   name text NOT NULL UNIQUE,
+  is_event_item boolean NOT NULL DEFAULT false,
   genus text NOT NULL DEFAULT '',
   details text NOT NULL DEFAULT '',
   height_inches double precision NOT NULL DEFAULT 0 CHECK (height_inches >= 0),
@@ -330,12 +332,14 @@ CREATE TABLE IF NOT EXISTS items (
   dual_dyeable boolean NOT NULL DEFAULT false,
   pattern_editable boolean NOT NULL DEFAULT false,
   no_recipe boolean NOT NULL DEFAULT false,
+  is_event_item boolean NOT NULL DEFAULT false,
   image_path text NOT NULL DEFAULT '',
   sort_order integer NOT NULL DEFAULT 0 CHECK (sort_order >= 0)
 );
 
 ALTER TABLE items ALTER COLUMN usage_id DROP NOT NULL;
 ALTER TABLE items ADD COLUMN IF NOT EXISTS no_recipe boolean NOT NULL DEFAULT false;
+ALTER TABLE items ADD COLUMN IF NOT EXISTS is_event_item boolean NOT NULL DEFAULT false;
 ALTER TABLE items ADD COLUMN IF NOT EXISTS image_path text NOT NULL DEFAULT '';
 ALTER TABLE items DROP COLUMN IF EXISTS no_habitat;
 
@@ -422,6 +426,7 @@ CREATE TABLE IF NOT EXISTS maps (
 CREATE TABLE IF NOT EXISTS habitats (
   id integer GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
   name text NOT NULL UNIQUE,
+  is_event_item boolean NOT NULL DEFAULT false,
   image_path text NOT NULL DEFAULT '',
   sort_order integer NOT NULL DEFAULT 0 CHECK (sort_order >= 0)
 );
@@ -472,6 +477,10 @@ ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS updated_by_user_id integer REFERENC
 ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS created_at timestamptz NOT NULL DEFAULT now();
 ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS updated_at timestamptz NOT NULL DEFAULT now();
 ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS sort_order integer NOT NULL DEFAULT 0 CHECK (sort_order >= 0);
+ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS display_id integer;
+UPDATE pokemon SET display_id = id WHERE display_id IS NULL;
+ALTER TABLE pokemon ALTER COLUMN display_id SET NOT NULL;
+ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS is_event_item boolean NOT NULL DEFAULT false;
 ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS genus text NOT NULL DEFAULT '';
 ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS details text NOT NULL DEFAULT '';
 ALTER TABLE pokemon ADD COLUMN IF NOT EXISTS height_inches double precision NOT NULL DEFAULT 0 CHECK (height_inches >= 0);
@@ -517,6 +526,7 @@ ALTER TABLE items ADD COLUMN IF NOT EXISTS updated_by_user_id integer REFERENCES
 ALTER TABLE items ADD COLUMN IF NOT EXISTS created_at timestamptz NOT NULL DEFAULT now();
 ALTER TABLE items ADD COLUMN IF NOT EXISTS updated_at timestamptz NOT NULL DEFAULT now();
 ALTER TABLE items ADD COLUMN IF NOT EXISTS sort_order integer NOT NULL DEFAULT 0 CHECK (sort_order >= 0);
+ALTER TABLE items ADD COLUMN IF NOT EXISTS is_event_item boolean NOT NULL DEFAULT false;
 
 ALTER TABLE recipes ADD COLUMN IF NOT EXISTS created_by_user_id integer REFERENCES users(id) ON DELETE SET NULL;
 ALTER TABLE recipes ADD COLUMN IF NOT EXISTS updated_by_user_id integer REFERENCES users(id) ON DELETE SET NULL;
@@ -535,6 +545,7 @@ ALTER TABLE habitats ADD COLUMN IF NOT EXISTS updated_by_user_id integer REFEREN
 ALTER TABLE habitats ADD COLUMN IF NOT EXISTS created_at timestamptz NOT NULL DEFAULT now();
 ALTER TABLE habitats ADD COLUMN IF NOT EXISTS updated_at timestamptz NOT NULL DEFAULT now();
 ALTER TABLE habitats ADD COLUMN IF NOT EXISTS sort_order integer NOT NULL DEFAULT 0 CHECK (sort_order >= 0);
+ALTER TABLE habitats ADD COLUMN IF NOT EXISTS is_event_item boolean NOT NULL DEFAULT false;
 ALTER TABLE habitats ADD COLUMN IF NOT EXISTS image_path text NOT NULL DEFAULT '';
 
 WITH ordered AS (
@@ -672,6 +683,7 @@ CREATE INDEX IF NOT EXISTS skills_sort_order_idx ON skills(sort_order, id);
 CREATE INDEX IF NOT EXISTS favorite_things_sort_order_idx ON favorite_things(sort_order, id);
 CREATE INDEX IF NOT EXISTS pokemon_types_sort_order_idx ON pokemon_types(sort_order, id);
 CREATE INDEX IF NOT EXISTS pokemon_sort_order_idx ON pokemon(sort_order, id);
+CREATE UNIQUE INDEX IF NOT EXISTS pokemon_display_event_item_key ON pokemon(display_id, is_event_item);
 CREATE INDEX IF NOT EXISTS life_tags_sort_order_idx ON life_tags(sort_order, id);
 CREATE INDEX IF NOT EXISTS item_categories_sort_order_idx ON item_categories(sort_order, id);
 CREATE INDEX IF NOT EXISTS item_usages_sort_order_idx ON item_usages(sort_order, id);