Enable slash command support for all party cog commands

[Claude]

The party cog commands were using the legacy @commands.command() and @commands.group() decorators, which only support text-based commands. This prevents users from discovering and using party commands through Discord's native slash command interface.

Changes

• Main command group: Converted @party.command → @party.hybrid_command for all 7 subcommands (create, delete, list, config, description, settime, rename-option)
• Template subgroup: Converted @party.group(name="template") → @party.hybrid_group(name="template") and all 6 template subcommands to @party_template.hybrid_command

All commands now work with both traditional text commands ([p]party create) and Discord slash commands (/party create) while maintaining backward compatibility with existing usage patterns.

# Before
@party.command(name="create")
async def party_create(self, ctx, ...):
    ...

# After  
@party.hybrid_command(name="create")
async def party_create(self, ctx, ...):
    ...

[psykzz]

@copilot fix the linting Failed to import party: 'HybridGroup' object has no attribute 'hybrid_command'

[Copilot]

@copilot fix the linting Failed to import party: 'HybridGroup' object has no attribute 'hybrid_command'

Fixed in 47dd1bb. HybridGroup objects only have .command() and .group() methods — not .hybrid_command() or .hybrid_group(). Subcommands registered via .command() on a HybridGroup are automatically hybrid, so the slash support is preserved. Changed:

• @party.hybrid_command(...) → @party.command(...) for all 7 party subcommands
• @party.hybrid_group(name="template") → @party.group(name="template")
• @party_template.hybrid_command(...) → @party_template.command(...) for all 6 template subcommands

[psykzz]

@copilot can you review this PR and fix and mistakes or issues?

[Copilot]

@copilot can you review this PR and fix and mistakes or issues?

Reviewed and fixed in 2e01b30. Found one real bug: ctx.message.delete() was being called in party_create and party_template_use without guarding against slash command invocations where ctx.message is None. Added if not ctx.interaction: guards around both deletions so they only run for text commands.