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fix: normalize environment_name to uppercase in api

Fix case sensitivity bug where API returns zero memory values when
environment_name parameter uses mixed case (e.g., "Mixed" instead of
"MIXED"). Profile lookups in memory configuration maps require
uppercase keys, but API was doing direct type cast without validation.

This caused all memory parameters (shared_buffers, effective_cache_size,
work_mem, maintenance_work_mem) to return 0 when map lookups failed.

Add profile.Parse() function to centralize parsing logic and ensure
case-insensitive matching through existing Set() normalization.

Fixes #37

Signed-off-by: Sebastian Webber <sebastian@swebber.me>