3.78.0

### Added

- Added the server of the Model Context Protocol (MCP) to the features page (experimental)

### Changed

- Improved the label of the cash positions in the holdings charts and table
- Excluded the cash position in the base currency from the holdings table on the overview tab of the home page (experimental)
- Extended the tools to get the activities, the portfolio and the watchlist in the server of the Model Context Protocol (MCP) to include the data source (experimental)
- Removed the deprecated `SymbolProfile` field from the endpoints `GET api/v1/activities`, `GET api/v1/activities/:id` and `POST api/v1/import`
- Improved the language localization for German (`de`)
- Upgraded `@openrouter/ai-sdk-provider` from version `3.0.0` to `3.1.0`
- Upgraded `ai` from version `7.0.37` to `7.0.114`
- Upgraded `dotenv` from version `17.4.2` to `18.0.3`

### Fixed

- Fixed the calculation of the interest in the account detail dialog for activities with a quantity other than one
- Fixed the positive performance from the all time high in the watchlist
- Fixed the portfolio calculation for holdings with historical market prices between the chart dates
- Fixed the asset profile identifier in the historical market data gathering of the `POST api/v1/activities` endpoint

### Special Thanks

- @dtslvr
- @KenTandrian