docs(tutorials): add token lifecycle tutorials

[thephez]

Summary

Adds a new Tokens tutorial section covering the basic issuer-managed token lifecycle, following the style and tone of the existing tutorials. Code is sourced from the new 3-Tokens/ scripts in platform-tutorials and wired into the tutorial code-sync system so the embedded examples stay in sync.

New pages

Under docs/tutorials/tokens/, in lifecycle order:

• Register a token contract — registers a contract carrying an issuer-managed token (base/max supply, owner-controlled mint and burn, history). The deeper TokenConfiguration breakdown is tucked into a collapsible dropdown so the basics stay front and center.
• Retrieve token info — contract info, total supply, status, and identity balances.
• Mint tokens — issues new tokens to the owner, increasing total supply.
• Burn tokens — permanently destroys tokens, decreasing total supply.
• Transfer tokens to an identity — moves tokens to a recipient using the transfer key.

The register, retrieve-info, and transfer pages cross-link to the matching DashMint Lab example-app sections, matching the existing contract/document tutorial pattern.

Wiring

• New docs/tutorials/tokens.md section index (toctree + scope note); the note flags that advanced features are out of scope for this initial series.
• tutorials/tokens added to the Tutorials toctree in docs/index.md, after Contracts and documents.
• Five 3-Tokens/*.mjs source mappings added to scripts/tutorial-sync/tutorial-code-map.yml.
• Regenerated _templates/sidebar-main.html.

Verification

• sync_tutorial_code.py --check reports all five token pages MATCH their source.
• The dropdown config descriptions were checked against the platform Rust source (TokenDistributionRules, ChangeControlRules, TokenTradeMode) for accuracy.

🤖 Generated with Claude Code

Preview build: https://dash-docs-platform--154.org.readthedocs.build/en/154/

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[thephez]

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