fix: preserve URL-embedded proxy auth; clearer empty-list + malformed-template errors (v0.2.2)

- _proxy_from_dict server branch falls back to auth embedded in the server URL when no
  explicit username/password keys are given, so it isn't dropped and the proxy keys
  with its credentials instead of colliding auth-less (L5)
- AioProxies(proxies=[]) now raises a clear 'empty' error, not the misleading
  'provide exactly one of' (nit)
- a malformed template re-raises with a naming message instead of a bare str.format
  ValueError (nit).

Signed-off-by: disqualifier <dev@disqualifier.me>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "aioproxies"
-version = "0.2.1"
+version = "0.2.2"
 description = "proxy parsing, formatting, health, and pool management for aiohttp/aioweb, camoufox, and socks5"
 requires-python = ">=3.10"
 dependencies = []