docs: add local server setup guides, GM handbook, and generated ID references

[andrenogrib]

Summary

This PR turns the current local server setup knowledge into versioned project documentation and adds a small set of opt-in helper scripts to make local runtime validation much easier.
The main goal is to make the project significantly easier to bootstrap, operate, and inspect without requiring contributors to reverse-engineer the runtime pack or dig through the source tree first.

What is included

• Translate and polish the documentation in English
• Add beginner-friendly local setup, startup, and test guides
• Add a practical GM/Admin handbook for in-game operations
• Add account and character management documentation
• Add a dedicated guide for the localhost game.dll runtime patch
• Add a scripts handbook that explains the PowerShell tooling and intended usage
• Add troubleshooting notes for real local runtime issues already observed
• Add generated quick-reference tables for maps, monsters, equipment, potions, and other item IDs
• Add a script to regenerate the reference markdown files from shared/map.h and GameDB

Why this is useful

• Reduces onboarding time for anyone trying to run the server locally
• Captures runtime-specific knowledge that would otherwise stay tribal or get lost in chat logs
• Makes GM/admin workflows easier to discover and safer to repeat
• Gives contributors copy-ready ID references instead of requiring manual SQL lookups every time
• Keeps the large Files/ runtime pack out of Git while still documenting how to work with it

Notes for reviewers

• No gameplay logic or engine behavior was changed in the client/server source
• Files/ is intentionally not included in the PR
• The helper scripts are local, opt-in tooling for setup, lookup, and documentation generation
• The generated ID references can be refreshed at any time with scripts/export-pt-reference-docs.ps1

High-level file groups

• docs/guides/*: local setup, startup, GM, account, runtime patch, scripts, and events docs
• docs/reference/*: command reference, item data reference, and generated lookup tables
• docs/reference/ids/*: dedicated ID section for maps, monsters, equipment, potions, and other items
• docs/troubleshooting/*: local runtime issue notes and workarounds
• scripts/*: local helper scripts for SQL restore, server startup, account provisioning, item/map/monster lookup, and doc export

Validation performed

• Regenerated the markdown references with scripts/export-pt-reference-docs.ps1
• Validated lookup helpers for maps and monsters against the local database
• Reviewed links and indexing so the new docs structure is navigable from the root README and the docs index