Feature/remove utc timezone

[abeckDev]

This pull request updates the handling and documentation of date and time parameters for station board and train connection queries, ensuring time inputs and internal processing consistently use German local time instead of UTC. The main changes improve both user-facing documentation and backend logic to avoid confusion and potential errors related to time zones.

Time zone handling improvements:

• In TimeTableService.cs, the logic for determining the effective time now checks if a date is provided and uses it directly (assuming German time). If not provided, it converts the current UTC time to German local time (Europe/Berlin), with a fallback to local system time if the timezone is not found or invalid. ([AbeckDev.DbTimetable.Mcp/Services/TimeTableService.csL51-R76](https://github.com/abeckDev/DB-TimetableAPI-MCPServer/pull/12/files#diff-a95998e7d0d552b4b7817fc93dba4f27d029847f4b0eff4cadf1dc1876b17308L51-R76))

Documentation updates:

• In Tools.cs, the descriptions for the dateTime parameter in both GetStationBoard and FindTrainConnections methods have been updated to specify "German Time" instead of "UTC" to clarify expected input format for users. ([[1]](https://github.com/abeckDev/DB-TimetableAPI-MCPServer/pull/12/files#diff-ddb8e104d23f7d1eb044fc2272c33ada96451c3b77e2f7fbc8fe54bf1e10003aL49-R49), [[2]](https://github.com/abeckDev/DB-TimetableAPI-MCPServer/pull/12/files#diff-ddb8e104d23f7d1eb044fc2272c33ada96451c3b77e2f7fbc8fe54bf1e10003aL122-R122))

[codecov]

Codecov Report

❌ Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.07%. Comparing base (1cdd7b0) to head (200ed86).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...ckDev.DbTimetable.Mcp/Services/TimeTableService.cs	53.84%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   76.11%   75.07%   -1.04%     
==========================================
  Files           5        5              
  Lines         314      325      +11     
  Branches       56       55       -1     
==========================================
+ Hits          239      244       +5     
- Misses         46       52       +6     
  Partials       29       29              

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[Copilot]

Pull Request Overview

This PR updates the timezone handling for date/time parameters in the Deutsche Bahn Timetable API integration. The changes clarify that user-provided timestamps should be in German Time (Europe/Berlin) rather than UTC, and implements automatic timezone conversion when no datetime is provided.

• Updated API documentation to specify "German Time" instead of "UTC" for datetime parameters
• Implemented timezone-aware default time handling that converts UTC to German Time (Europe/Berlin)
• Added fallback logic to handle timezone exceptions

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
AbeckDev.DbTimetable.Mcp/Tools.cs	Updated parameter descriptions for GetStationBoard and FindTrainConnections to indicate German Time instead of UTC
AbeckDev.DbTimetable.Mcp/Services/TimeTableService.cs	Implemented timezone conversion logic in GetStationBoardAsync to use Europe/Berlin timezone when no date is provided

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[abeckDev]

@copilot implement testing for the added timezone logic. Check the correct parsing of input dates and the fallback to the auto generated ones.

[Copilot]

@abeckDev I've opened a new pull request, #13, to work on those changes. Once the pull request is ready, I'll request review from you.