Initial service implementation

.env.example

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+PORT=3000
+API_KEY=
+CACHE_TTL_MINUTES=5
+CACHE_SWEEP_INTERVAL_MINUTES=5
+RATE_LIMIT_WINDOW_MINUTES=5
+RATE_LIMIT_MAX=30
+MAX_CONCURRENT_SCANS=4
+CLONE_TIMEOUT_SECONDS=45
+DEFAULT_SSH_KEY_NAME=loc_via_git_ed25519
+GENERATE_SSH_KEY_IF_MISSING=false
+TRUST_PROXY=false
+SSH_KEYS_DIR=/app/keys
+TMP_DIR=/tmp/loc-via-git