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Stop python-dotenv warning about flexmeasures.cfg on startup (#2845)

* Read FLEXMEASURES_ENV from flexmeasures.cfg as Python, not as a dotenv file

The config file is Python, so python-dotenv warned "could not parse statement" about any line that is not a plain assignment, such as an import on its first line.
Since #2811 the Docker image finds its mounted config again, so every container logged this warning on startup.
Now the file is parsed with ast, without running it, and only a top-level string literal counts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: F.N. Claessen <claessen@seita.nl>

* Changelog: no python-dotenv warning about flexmeasures.cfg on startup

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: F.N. Claessen <claessen@seita.nl>

* Leave the OpenAPI spec's version alone, as this PR does not change the API

The generate-openapi-specs hook stamped it with the development version.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: F.N. Claessen <claessen@seita.nl>

* Read FLEXMEASURES_ENV from a flexmeasures.cfg saved with a byte order mark

Parsing the decoded text kept the BOM, so the parse failed and the app silently ran in production; parsing the bytes honours a BOM and a coding declaration, as running the file does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: F.N. Claessen <claessen@seita.nl>

* Warn when flexmeasures.cfg does not plainly set FLEXMEASURES_ENV, and let its last assignment win

A cfg that cannot be read or parsed, or that sets FLEXMEASURES_ENV to an expression, used to fall back to the default environment silently.
A later assignment of an expression now also undoes an earlier string literal, as it does when the file runs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: F.N. Claessen <claessen@seita.nl>

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Signed-off-by: F.N. Claessen <claessen@seita.nl>
Co-authored-by: Claude Opus 5.5 <n... (continued)

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