Add comprehensive ServiceIO PlaceholderAPI documentation

[Copilot]

This PR adds comprehensive documentation for ServiceIO's PlaceholderAPI integration introduced in version 2.3.0, based on direct analysis of the ServiceIO source code.

What's Added

New Documentation Page: content/docs/serviceio/placeholders.mdx

Documents all ServiceIO placeholders using the format %serviceio_<placeholder>%, including:

• Player Information: prefix, suffix, displayname
• Economy (Standard): balance, balance_<world>, balance_formatted, balance_formatted_<world>
• Economy (Bank System): bank, bank_balance, bank_balance_formatted with world-specific variants
• Bank Management: banks, banks_<world> for listing available banks
• Permission Groups: group, groups
• VaultUnlocked Compatibility: Complete set of %vaultunlocked_*% placeholders for compatibility reasons

Key Features

• Complete placeholder reference extracted directly from ServiceIO source code analysis
• World-specific variants for economy and bank placeholders
• Practical examples for chat formats, scoreboards, world-specific usage, and multi-bank setups
• Requirements section detailing ServiceIO v2.3.0+ and PlaceholderAPI dependencies
• Enhanced troubleshooting guide for common placeholder issues with proper usage validation
• Professional formatting using fumadocs components with proper type attributes and MDX structure

Navigation Update: Added the new placeholders page to the ServiceIO documentation section in meta.json, positioned logically in the Introduction section.

The documentation now accurately reflects all 20+ placeholders available in the ServiceIO codebase and provides developers with everything needed to implement ServiceIO placeholders in their configurations.

Fixes #97.

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[NonSwag]

You now have the appropriate permissions to perform tests and access the ServiceIO repository
Look at the ServiceIO code and create a list of all available placeholders
@copilot

[Copilot]

You now have the appropriate permissions to perform tests and access the ServiceIO repository
Look at the ServiceIO code and create a list of all available placeholders
@copilot

I've analyzed the ServiceIO source code and updated the documentation with the complete list of all available placeholders. The analysis revealed many more placeholders than initially documented:

Key findings:

• Economy placeholders: Both standard economy (balance, balance_formatted) and bank system (bank, bank_balance, bank_balance_formatted)
• World-specific variants: Most economy placeholders support world-specific versions (e.g., %serviceio_balance_world%)
• Bank management: Additional placeholders for listing banks (%serviceio_banks%)
• VaultUnlocked compatibility: Complete set of advanced multi-currency placeholders using %vaultunlocked_*% format

The documentation now includes 20+ placeholders with practical examples for different use cases including world-specific economy, multi-bank setups, and advanced features.

Commit: fb36155

[NonSwag]

there will never be "default values"
there is only improper placeholder usage (not formatted and shows the literal placeholder)

[Copilot]

Updated troubleshooting text to clarify that placeholders show literal text instead of expected values when improperly used, rather than mentioning "default values" in commit 6db60d1

[NonSwag]

@copilot
look at the requested changes

[Copilot]

@copilot
look at the requested changes

I've addressed all the requested changes in commit 6db60d1:

• Fixed version numbers (2.3.1 → 2.3.0)
• Removed unnecessary import statement
• Added type attributes to callouts
• Updated VaultUnlocked wording for clarity
• Removed MOTD example
• Enhanced troubleshooting section

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