Backend: Customer module (list/search/detail) + working session auth + pnpm

Adds the unified Customer API against the migrated data:
- customers.service: list (search across name/email/phone/city/legacy id,
  business-line filter, pagination + per-row _count flags), detail (identity +
  legacyRefs + properties/services/trust + policies with installments/vehicles/
  drivers/beneficiaries/claims/docs + recent transactions + a per-domain/
  currency ledger summary), and stats.
- customers.controller: GET /customers, /customers/:id, /customers/stats,
  guarded by AuthenticatedGuard. Registered in AppModule.
- Fix LocalAuthGuard to call super.logIn so a session is actually established
  (login previously succeeded but persisted no session -> 403 afterwards).
- apps/api/scripts/seed-user.mjs: idempotent Argon2 admin seed.

Tooling: adopt pnpm as the package manager (machine npm is a pnpm shim that
ignores the workspaces field). Add pnpm-workspace.yaml (+ onlyBuiltDependencies
for argon2/prisma/nest native builds), switch the api's @jorgecuadros/database
dep to workspace:*, add @types/passport, track pnpm-lock.yaml, drop the stale
package-lock.json.

Verified end-to-end against the dev DB: login sets a session cookie; stats
returns 1682 customers / 526 both-lines / 45861 transactions; search + detail
return the full cross-line customer view (properties+services AND policies AND
a unified transaction statement).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pnpm-workspace.yaml

@@ -0,0 +1,20 @@
+packages:
+  - "apps/*"
+  - "packages/*"
+
+allowBuilds:
+  '@nestjs/core': set this to true or false
+  '@prisma/client': set this to true or false
+  '@prisma/engines': set this to true or false
+  argon2: set this to true or false
+  prisma: set this to true or false
+
+# Native / postinstall build scripts we trust (argon2 native addon, Prisma
+# engine download + client generation, Nest core). pnpm blocks build scripts
+# by default; these are required for the API to run.
+onlyBuiltDependencies:
+  - "@nestjs/core"
+  - "@prisma/client"
+  - "@prisma/engines"
+  - argon2
+  - prisma