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feat: implement legacy lambdas endpoints in lamb2 (#462)

* feat: implement legacy lambdas endpoints in lamb2

ports the remaining endpoints from the deprecated lambdas service so all
callers under /lambdas/* can be served by lamb2 alone.

new endpoints:
- post /crypto/validate-signature: eip-1654 signature validation via
  the existing l1provider and @dcl/crypto's authenticator.
- get /collections/wearables-by-owner/:owner: returns [{urn, amount,
  definition?}] for the given owner. uses the existing wearablesfetcher
  for on-chain items, fetchthirdpartywearablesfromthirdpartyname for the
  ?collectionid= third-party path, and wearabledefinitionsfetcher for
  ?includedefinitions.
- get /collections/wearables: paginated catalog query with
  collectionid/wearableid/textsearch filters and limit/lastid cursor.
  off-chain (base avatars via fetchbasewearables) merged with on-chain
  l1+l2 collection subgraphs.
- get /profile/:id: alias to the existing profilehandler so the legacy
  singular path keeps working.

unit tests cover validation errors, happy paths, third-party delegation,
filter pass-through, and pagination cursor preservation.

* refactor: split catalog filter graph query into its own fetcher

moves the on-chain filter subgraph query out of the per-endpoint
wearables-catalog logic file and into logic/fetch-elements/, matching
the convention used by the other graph-query helpers (fetch-items,
fetch-third-party-wearables, fetch-name-owner, etc).

- new logic/fetch-elements/fetch-wearables-by-filters.ts: exports
  fetchWearablesByFilters(theGraph, criteria, pagination) -> string[]
  with the l1+l2 cursor handoff and item-type restriction.
- wearables-catalog-handler.ts now does the off-chain base avatar
  filter and the off-chain/on-chain merge inline. small enough to
  keep in the handler and removes the separate orchestration module.
- delete logic/wearables-catalog.ts.

new test/unit/logic/fetch-elements/fetch-wearables-by-filters.spec.ts
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