Deprecate STORAGE_API_VERSION=1 (legacy meshflow-api ingest URLs)

[pskillen]

Summary

StorageAPIWrapper supports two URL layouts via api_version, selected in _get_url() (src/api/StorageAPI.py):

api_version	Packet ingest	Node upsert
1 (legacy)	POST /api/raw-packet/	POST /api/nodes/
2 (current)	POST /api/packets/{nodenum}/ingest/	POST /api/packets/{nodenum}/nodes/

v1 is the only use of the legacy paths in this repo. MeshCore upload already hard-codes api_version=2 in src/main.py.

Defaults today:

• STORAGE_API_VERSION env default 1 in main.py (.env.example already documents 2)
• StorageAPIWrapper(..., api_version: int = 1) constructor default

Goal

Remove v1 support so all Meshtastic feeders use v2 ingest URLs aligned with meshflow-api.

Scope (bot)

• Delete the api_version == 1 branch in StorageAPIWrapper._get_url()
• Drop api_version parameter (or fix at 2 with a deprecation warning period if needed)
• Change STORAGE_API_VERSION default to 2 in main.py; remove env var if no longer needed
• Same for STORAGE_API_2_VERSION if redundant after cleanup
• Update tests, docs/MESHTASTIC.md, and any deploy snippets
• Grep for api_version, STORAGE_API_VERSION, raw-packet

Coordination (API)

• pskillen/meshflow-api#319 — API-side retirement of v1 routes / OpenAPI cleanup

Acceptance

• Meshtastic bot with default config talks only to /api/packets/{nodenum}/ingest/ and /api/packets/{nodenum}/nodes/
• No code path references /api/raw-packet/ or v1 node upsert URL