Store password as hash in .env

[Syr0]

Storing the password as plain is horrible.

[syngron]

I just removed the hashPassword function in this line and used the hash directly as password:
https://github.com/mtrossbach/noah-mqtt/blob/main/internal/growatt/client.go#L42

[mtrossbach]

While using the hashed password works in specific cases, it's not a sustainable solution for all users due to the complexities of Growatt's password hashing. Their non-standard and region-specific algorithm makes it difficult for most users to maintain them correctly if Growatt decides to change it (again).

Providing a way for users to hash their passwords would be ideal, but requires further investigation into Growatt's hashing methods for each region and API version.