feat(network): resolve DPI names in traffic-flow statistics

[jontybrook]

Problem

unifi_get_traffic_flow_statistics returns DPI application_id and category_id, but leaves application_name and category_name null. Current controllers expose the required names through the official Integration API.

Traffic-flow rows carry the application and category IDs separately, while the application catalogue uses the compound key:

(category_id << 16) | application_id

Proposed solution

• Fetch and cache the complete DPI application/category catalogue.
• Follow controller pagination rather than assuming the requested page size is honoured.
• Best-effort enrich traffic-flow Top Applications with names.
• Keep names null if the catalogue is unavailable or lacks a match; the statistics call should still succeed.
• Apply the shared manager behaviour consistently to MCP, REST and GraphQL.

Validation

Verified read-only against a current UniFi controller: the Integration API returned complete application/category catalogues and resolved live flow rows including GitHub, SSL/TLS, HTTP, Spotify and ChatGPT.