refactor(p): complete TecDoc → P content rename

Finishes 3b14431 (which only captured the file renames): apply the
identifier/endpoint/env/UI changes so the code matches the new paths
— PModule/PController/PSourceDbService, @Controller("p"), /p/oem,
config key `p`, P_DB_ENABLED/P_DB_URL, "P kataloğundan…" copy.

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

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

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