Add Azure App Service publishing auth fixtures

[DENGXUELIN]

/claim #1717

Summary

Adds fixture-backed App Service publishing-plane basic authentication evidence handling to azure-review.

Changes include:

• adds AZ-APP-PUBLISH-01 through AZ-APP-PUBLISH-08 for App Service and slot inventory, SCM policy evidence, FTP policy evidence, slot parity, non-basic deployment replacement, credential invalidation, policy/audit coverage, and unsupported runtime-only evidence
• adds a supplemental App Service publishing evidence output table
• extends the Azure benchmark checklist with Terraform/AzAPI examples, Azure CLI evidence commands, review checks, and severity guidance for basicPublishingCredentialsPolicies/scm and basicPublishingCredentialsPolicies/ftp
• adds benign/vulnerable Terraform fixtures for disabled SCM/FTP publishing basic auth with OIDC/audit/policy evidence versus runtime-auth-only hardening with SCM/FTP publishing basic auth still enabled

Why

The existing #1718 and #1721 PRs add useful skill/checklist guidance, but neither adds local regression fixtures. This PR keeps the fix skill-local and adds concrete benign and vulnerable Terraform examples so future reviews distinguish runtime App Service controls from SCM/Kudu/WebDeploy/ZipDeploy and FTP publishing credential exposure.

Validation

• git diff --check origin/main...HEAD
• Markdown fence-balance check for modified files
• Marker check for AZ-APP-PUBLISH-01 through AZ-APP-PUBLISH-08, App Service Deployment-Plane Basic Authentication Evidence, basicPublishingCredentialsPolicies/scm, basicPublishingCredentialsPolicies/ftp, webdeploy_publish_basic_authentication_enabled, ftp_publish_basic_authentication_enabled, AppServiceAuditLogs, configure-basic-auth-disable, and version: "1.0.1"
• Terraform fixture marker check for disabled/allowed publishing basic auth, slot parity, runtime auth, and audit evidence
• Added-line ASCII scan
• Added-line sensitive/public-contact pattern scan
• git merge-tree --write-tree origin/main HEAD

Bounty

I have read and agree to the CONTRIBUTING.md bounty terms. Requested Improver Moderate tier if accepted.