tapo: drop IP-address handling, use host string throughout

[andig]

Summary

Cleanup follow-up to #29768. Hands the configured URI's host straight to the Tapo library instead of round-tripping through netip.Addr.

• removes the netip.ParseAddr step (and the "invalid ip address" rejection of hostnames)
• consolidates URL parsing into one step
• no DNS resolution lives in evcc anymore — the standard library resolver handles it via net/http inside the tapo library

Companion upstream PR: insomniacslk/tapo#8 (drops netip.Addr from the public API; tapo.NewPlug now takes a host string).

Replace #29768

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider whether tapo.NewPlug should receive u.Hostname() instead of u.Host, as the current change will now pass through any explicit port as part of the host string, which differs from the previous netip.ParseAddr(url.Hostname()) behavior.
• The NewConnection URI validation only checks u.Host == ""; if you care about rejecting malformed inputs like missing scheme or path-only strings, you might want to use url.ParseRequestURI or add an explicit scheme/host sanity check.
• Given the temporary replace directive in go.mod, you might want to add a brief inline comment (e.g. // TODO: drop once insomniacslk/tapo#8 is tagged) to make the intent clear to future maintainers.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider whether `tapo.NewPlug` should receive `u.Hostname()` instead of `u.Host`, as the current change will now pass through any explicit port as part of the host string, which differs from the previous `netip.ParseAddr(url.Hostname())` behavior.
- The `NewConnection` URI validation only checks `u.Host == ""`; if you care about rejecting malformed inputs like missing scheme or path-only strings, you might want to use `url.ParseRequestURI` or add an explicit scheme/host sanity check.
- Given the temporary `replace` directive in `go.mod`, you might want to add a brief inline comment (e.g. `// TODO: drop once insomniacslk/tapo#8 is tagged`) to make the intent clear to future maintainers.

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