Adds new integration [akshimassar/ha-fortum]

[akshimassar]

Add Fortum custom integration with statistics sources for Home Assistant Energy Dashboard, plus a Fortum-specific dashboard strategy for detailed visualization.

Checklist

• I've read the publishing documentation.
• I've added the HACS action to my repository.
• (For integrations only) I've added the hassfest action to my repository.
• The actions are passing without any disabled checks in my repository.
• I've added a link to the action run on my repository below in the links section.
• I've created a new release of the repository after the validation actions were run successfully.

Links

Link to current release: https://github.com/akshimassar/ha-fortum/releases/tag/v4.1.2
Link to successful HACS action (without the ignore key): https://github.com/akshimassar/ha-fortum/actions/runs/23587197685/job/68683553742
Link to successful hassfest action (if integration): https://github.com/akshimassar/ha-fortum/actions/runs/23587197685/job/68683553958

[hacs-bot]

Your branch seems out of date. Please update your branch with the latest changes from the base branch.

[hacs-bot]

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