Add postal code and street address filters to /v1/search

Feature Request

Add support for filtering companies by postal code and street address in the /v1/search endpoint.

Use Case

Users want to search for companies with specific criteria (SNI code, employee count) within precise geographic areas - at postal code level or even specific streets. The current county filter is too broad for many use cases.

Proposed Solution

Add new query parameters to /v1/search:

• postal_code - Filter by postal code (e.g., 111 22)
• street - Filter by street name (partial match)

The data already exists in the company payload:

"address": {
    "street": "Exempelgatan 1",
    "postal_code": "111 22",
    "city": "Stockholm",
    ...
}

Example Usage

GET /v1/search?sni=62010&postal_code=111 22
GET /v1/search?q=*&street=Kungsgatan&city=Stockholm