[chottokun]

🎯 What: The _proxy_to_tei helper in src/app/dependencies/services.py now enforces an explicit whitelist (ALLOWED_TEI_PATHS = {"/v1/embeddings", "/rerank", "/predict", "/embed"}) before appending paths to tei_url.

⚠️ Risk: Previously, unvalidated path arguments passed to _proxy_to_tei allowed potential Server-Side Request Forgery (SSRF) or arbitrary internal endpoint targeting on the TEI server instance.

🛡️ Solution: Validates that path is in ALLOWED_TEI_PATHS, raising HTTP 400 if invalid, and safely formats the target URL using tei_url.rstrip('/'). Comprehensive unit tests were added to src/tests/test_tei_proxy.py.

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PR created automatically by Jules for task 10672689314195510687 started by @chottokun

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