Migratus entry points for search_documents.filters.

HTTP API routes and admin web UI handlers for wagoe-search.

API Endpoints (mounted under /api/v1):
  POST   /search/:index-id              — search
  POST   /search/:index-id/suggest      — trigram suggestions
  POST   /search/documents              — index a document
  DELETE /search/documents/:type/:id    — remove a document

Admin Web UI (mounted under /web/admin):
  GET    /search                        — list all indices
  GET    /search/:index-id              — index detail + live search form
  POST   /search/:index-id/search       — HTMX search results fragment

Searching takes a signed-in user; indexing, removing and the admin pages
take the admin role (BOU-568).

Search, suggest and the admin pages serve only an index whose definition
opts in with `:api? true` or an `:api :authorize` fn; a hook, when set, must
accept the request. Any other index answers 404, as an unknown one does, so
a caller cannot tell the two apart.

An index whose definition lists `:tenant-id` among its `:filters` is
tenant-scoped. A search of one reads the request's resolved tenant, and only
for a caller in it (`access/in-tenant-scope?`); a `tenant_id` the caller
sends is dropped. With no tenant resolved, only a global admin may search it, with
whatever filters they send. Anyone else gets 403.

Integrant lifecycle management for the search module.

Config keys:

:wagoe/search
  {:db-ctx      (ig/ref :wagoe/db-context)
   :indexes     {index-id definition}   ; from config.edn
   :contributed {index-id definition}}  ; modules' :search parts

  Returns {:store <ISearchStore> :engine <ISearchEngine>}

:wagoe/search-routes
  {:search-service (ig/ref :wagoe/search)}

  Returns {:api [...] :web [...] :static []} for composition
  by the HTTP handler.

Database persistence for search documents.

Implements ISearchStore using next.jdbc + HoneySQL for DML
and raw parameterized SQL for FTS-specific queries.

Strategies chosen by the adapter's capabilities (ADR-039):
- :full-text — to_tsvector/plainto_tsquery + ts_rank + ts_headline, and
  pg_trgm suggestions where it is installed; without it, a LOWER/LIKE fallback
- :on-conflict — INSERT … ON CONFLICT DO UPDATE; without it, delete and
  insert in one transaction

Deprecated: a process-global registry of search index definitions.

Hand definitions to `:wagoe/search` instead — under `:indexes` in config or
a module's `:search` part — and bind them with
`wagoe.search.core.index/defsearch`. The search service still reads this
registry for an id its component does not hold, and logs once per such id.

Key functions:
- defsearch macro       — define and register an index
- register-search!      — low-level registration
- get-search            — look up by index-id
- list-searches         — list registered index ids
- clear-registry!       — reset registry (test fixtures)

SearchService orchestrates document indexing and search queries.

Implements ISearchEngine by coordinating:
- core/index     — document construction
- core/query     — query sanitization
- definitions    — the index definitions this service was built with, then
                   the deprecated global registry
- ISearchStore   — persistence operations

pg_trgm, which suggestions on PostgreSQL use. Creating it can take a
privilege the migration user lacks; suggestions then use LIKE (BOU-661).