## Context
Webhook reads queried both the webhook and application tables, then
rebuilt the same flat webhook representation already maintained by the
workspace cache.
This affected REST, GraphQL, and the webhook listing tool.
## What changed
- Read `findAll` and `findById` from `flatWebhookMaps`
- Keep `findById` as a keyed ID lookup
- Preserve `findAll` ordering by `createdAt`
- Remove unused webhook and application repository wiring
The flat webhook cache contains only active webhooks and already
includes the application universal identifier needed by the DTO
conversion.
## Expected impact
On a warm workspace cache, webhook reads avoid queries to both the
webhook and application tables. `findAll` still iterates over every
returned webhook, matching the original query's result cardinality,
while `findById` uses a keyed lookup.
## Validation
- Typecheck reports no errors in the changed files
- `findAll` ordering and `findById` missing-record behavior are
preserved
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