Feat: Sync Streams from Mediamtx to TAK Server

[secypher]

User-facing summary

• Added product interop authorization brokering for integrations
• Products can now request connection auth details for another product through the API
• Supports multiple auth types: mTLS, bearer token, and basic auth with optional read-only streaming credentials

Why It's Good for the Product (Release Goal)

• Makes cross-product stream integration easier to set up and automate
• Enables MediaMTX-to-TAK style integrations without manual credential handling
• Standardizes how products discover and receive integration auth details

Any Other You'd Like to Mention

• Implemented as a new /api/v1/product/interop/{tgtproduct}/authz endpoint
• Adds request/response schemas for interop auth metadata exchanged between product

[secypher]

DRAFT PR, Work in progress

What it does well

• Automatic polling exists: tak-rmapi adds a background sync loop with STREAM_SYNC_INTERVAL defaulting to 60.0.
• End-to-end flow exists:

1. tak-rmapi ensures interop via RM
2. fetches MTX auth from RM
3. calls MTX /interop/streams
4. diffs desired vs existing TAK video connections
5. creates/updates/deletes managed TAK entries

• Active streams only: MTX side filters to ready/sourceReady.
• Automatic cleanup exists: stale TAK entries created by this sync worker are removed.

#160
pvarki/python-tak-rmapi#134
pvarki/python-mediamtx-rmmtxauthz#54