refactor(p): rename TecDoc → P (parts) across the cross-reference feature

Drop the third-party brand name from the product surface and code.
The OEM detail feature is now "P" (short for parts) everywhere:
endpoint /p/oem, PModule/PController/PSourceDbService, config key
`p`, env P_DB_ENABLED/P_DB_URL, UI copy ("P kataloğundan…"), and the
unused tab label. Physical snapshot DB stays `td` (server-only).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/api/src/integrations/p/p.module.ts

@@ -0,0 +1,15 @@
+import { Module } from "@nestjs/common";
+import { TecdocSourceDbService } from "./tecdoc-source-db.service";
+import { TecdocController } from "./tecdoc.controller";
+
+/**
+ * OEM cross-reference lookup against the imported TecDoc snapshot (db `td`).
+ * Raw read-only queries — intentionally no Drizzle schema modelling, mirroring
+ * CatalogSourceDbModule. Self-disables when TECDOC_DB_* env is unset.
+ */
+@Module({
+  controllers: [TecdocController],
+  providers: [TecdocSourceDbService],
+  exports: [TecdocSourceDbService],
+})
+export class TecdocModule {}