chore(deploy): add the staging importer environment template

[ogulcan-gurcaglar]

Adds the environment template for the staging importer.

[zeropath-ai-staging]

✅ No security or compliance issues detected. Reviewed everything up to 33df12e.

Security Overview

• 🔎 Scanned files: 1 changed file(s)
• 🔗 Scan Link: https://staging.branch.zeropath.com/app/repositories/76e78572-4c4d-4c18-8702-81b7a5a6273c?scanId=c20ae7eb-7a07-4c1c-aaa9-c12fc84ac8f0&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Configuration changes	► config/deploy.env     Add new deployment environment file for staging importer with placeholder and example values

[zeropath-ai-staging]

✅ No security or compliance issues detected. Reviewed everything up to 33df12e.

Security Overview

• 🔎 Scanned files: 1 changed file(s)
• 🔗 Scan Link: https://staging.branch.zeropath.com/app/repositories/5eea4b94-6a72-403c-af68-60abe8a1d179?scanId=7fee5bbc-63c6-4d45-8905-9fc89de5ecc2&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Configuration changes	► config/deploy.env     Add new deployment environment file with placeholder credentials and connection URLs