Adding API Endpoints

[lazyperson1020]

Port 8503 is used for API

[lazyperson1020]

The following curl requests are supported

curl http://localhost:8503/api/filings
# Process filings (replace with actual accession number)
curl -X POST http://localhost:8503/api/filing/0000320193-23-000077/parse
curl -X POST http://localhost:8503/api/filing/0000320193-23-000077/clean
curl -X POST http://localhost:8503/api/filing/0000320193-23-000077/summarize
# Download filing
curl -X POST http://localhost:8503/api/filings/download \
-H "Content-Type: application/json" \
-d '{
    "ticker": "AAPL",
    "form_type": "10-K",
    "limit": 5,
    "after_date": "2023-01-01"
}'