🛡️ Sentinel: Allow configurable Cipher Suite

[google-labs-jules]

🛡️ Sentinel: Allow configurable Cipher Suite

Vulnerability: The entrypoint.sh script hardcoded DHE-RSA-AES256-SHA as the only allowed cipher suite.
Impact: Users were unable to use modern, stronger ciphers (e.g., AES-GCM) supported by newer SoftEther versions and TLS 1.2+ clients.
Fix: Introduced CIPHER_SUITES environment variable with a default of DHE-RSA-AES256-SHA. This allows overriding the cipher suite at runtime.
Verification: Reviewed entrypoint.sh logic to ensure the variable is used and defaults correctly. Verified script syntax with bash -n.

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PR created automatically by Jules for task 14272976687347461831 started by @bluPhy

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