A community based topic aggregation platform built on atproto

test: add clarifying comment for PDS auth scheme

Add comment clarifying that PDS uploadBlob calls use Bearer scheme
(standard atproto server auth) rather than DPoP (AppView client auth).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Changed files
+1
tests
+1
tests/integration/blob_upload_e2e_test.go
···
assert.Equal(t, "POST", r.Method, "Should be POST request")
assert.Equal(t, "/xrpc/com.atproto.repo.uploadBlob", r.URL.Path, "Should hit uploadBlob endpoint")
assert.Equal(t, "image/png", r.Header.Get("Content-Type"), "Should have correct content type")
+
// Note: This is a PDS call, so it uses Bearer (not DPoP)
assert.Contains(t, r.Header.Get("Authorization"), "Bearer ", "Should have auth header")
// Return mock blob reference