A few fixes and improvements

[vuxeim]

This PR:

Command /eco set <nick> 0

Previously that command was telling Only positive numbers allowed. Due to improper use of @Execute annotation expected syntax was /eco set 0 <nick>.

Decimal formatting

All real numbers X.YXX (where X is non zero value and Y is 0) were incorrectly formatted as X.XX.
Eg. 1025 -> 1.25k

Math improvements

See the comments.

[gemini-code-assist]

Code Review

This pull request introduces performance optimizations and formatting fixes to the decimal formatting utilities, as well as changes to the admin set command. The review feedback highlights three key issues: first, the zeroPad in DecimalFormatterImpl is calculated before rounding, which causes incorrect formatting for values that round up (e.g., 1.095 becoming 1.010 instead of 1.10); second, the optimized getLengthOfIntegralPart in DecimalFormatterUtil can trigger a StackOverflowError on Long.MIN_VALUE and suffers from precision loss with Math.log10 on large numbers; and third, the command constraints in AdminSetCommand prevent setting fractional balances between 0 and 1. Solutions are provided for each of these issues.

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