Remove settings and statistics from server API and NetworkService

[chrxh]

Since simulations are serialized into a single sim file, the separate settings and statistics payloads no longer exist. The client still sent empty strings for them and the server still stored them.

Changes

Server (scripts/Server/main.py)

• Drop the settings and statistics columns from the Simulation model, so new databases no longer create them.
• /uploadsimulation and /replacesimulation no longer read or store those fields. settings was a required form field before; removing it keeps older clients working, since unknown form fields are ignored anyway.
• Remove the /downloadsettings and /downloadstatistics endpoints. They had no caller in the client.

Client (source/Network/NetworkService.cpp)

• Remove the empty placeholder fields from uploadResource and replaceResource.

Tests

• Adapt the upload helper and the resource API tests; the download test now covers /downloadcontent only.

Notes

No database migration is included, as agreed. An existing production database keeps both columns physically, and settings is NOT NULL without a default there, so inserts from the new code would fail against it. If the live database is kept, it needs:

ALTER TABLE simulations DROP COLUMN settings, DROP COLUMN statistics;

Testing

• NetworkTests.exe (4), EngineInterfaceTests.exe (174), PersisterTests.exe (70) all pass.
• The Python server tests were not run: no Python interpreter is available on the development machine.

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