docs: bilingual architecture doc (EN + RU)

[BarisSozen]

What

Adds a deep, bilingual architecture reference for @hashlock-tech/mcp, mirroring the hashlock-markets master-doc template and cross-linking back to it (and to the hashlock-sdk doc this package wraps).

• docs/architecture/ARCHITECTURE.md (English)
• docs/architecture/ARCHITECTURE.ru.md (Russian parity)
• README now links to the doc (EN + RU)

Phase 2 of the architecture-docs effort — per-repo docs inside each core product sibling repo.

Shape (matches the template)

Language-switcher links · Mermaid diagrams (system-at-a-glance + tool-call sequence; English labels) · every non-obvious claim carries a path:line · mandatory "how this repo connects to hashlock-markets" section (§8).

Depth highlights

• The thin-adapter-over-SDK design: 6 tools each forwarding to one @hashlock-tech/sdk method
• The create_rfq intent compiler — the 59-line tool description is an LLM sub-prompt (EN+Turkish verb mapping, chain inference, restate-before-spend), pinned by tests
• Two transports, same 6 tools: local stdio (this npm package) vs remote streamable-http (the backend mcp-gateway) — and an explicit "do NOT conflate with services/remote-mcp" note
• Distribution across npm / MCP Registry / Smithery / Glama

Honest flags (surfaced, not fixed — out of scope for a docs PR)

§8 documents real drift rather than silently correcting it:

• Endpoint default contradiction — code defaults to /graphql (correct; the comment explains /api/graphql 401s for external clients), but README/mcp-registry.json/smithery.yaml all document the broken /api/graphql default
• Three version numbers — package.json 0.2.0, in-code McpServer 0.1.12, MCP-Registry 1.2.0
• Stale legacy refs — llms-install.md + .env.example cite the compromised 142.93.106.129 IP and the wrong package name @hashlock/mcp
• CI runs no tests — ci.yml is install→lint→build only; the ~30-case suite runs only locally

Note: one small README fix included

The committed README's Links section ended mid-line with a truncated SIWE-login URL (](https://has — no closing paren, no newline). Since this PR appends an Architecture section right there, I completed that link to its unambiguous target (hashlock.markets/sign/login, already spelled out in the link text) rather than leave a visibly dangling link. No other content changed.

Verification

Mermaid fences balanced; mutual EN↔RU links resolve; every cited repo path exists. Docs-only (+ the one-line README link completion).

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d7506a3b-8ae5-4a34-8562-0f9ada17946d

📥 Commits

Reviewing files that changed from the base of the PR and between 440a40d and c0a0335.

📒 Files selected for processing (3)

• README.md
• docs/architecture/ARCHITECTURE.md
• docs/architecture/ARCHITECTURE.ru.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/architecture-doc

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