fix: remove double quotes from pgpm env output

[pyramation]

Summary

Removes the double-quote wrapping from pgpm env export statements. Previously the output was:

export PGHOST="localhost"
export PGPORT="5432"

Now it outputs:

export PGHOST=localhost
export PGPORT=5432

The escaping logic for backslashes and embedded quotes within values was also removed since the quotes are no longer present.

Review & Testing Checklist for Human

• Edge case: passwords with spaces or shell metacharacters. The old code quoted and escaped values defensively. The new code outputs bare values. If a profile ever has a password like my password or p@ss$word, eval "$(pgpm env)" will break. Verify this is acceptable for all current and expected profiles (default + supabase).
• Run pgpm env and pgpm env --supabase locally and confirm clean output

Notes

• Devin run
• Requested by @pyramation

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