Build Backend API Spec for Game Session Orchestration

[popsman01]

Description
Design a backend or serverless API contract for wallet-driven game orchestration, transaction preparation, and read models.

Motivation
This functionality is a required building block for the Tossd game flow. Without it, dependent features cannot be built or tested correctly.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Primary files: .Tossd/specs/soroban-coinflip-game/design.md

Proposed Solution
Complete the following in a focused PR off feature/backend-api-spec:

• Define endpoints and request-response shapes
• Document trust boundaries with the contract
• Keep the API surface minimal and auditable

Technical Implementation

Files to modify:

• .Tossd/specs/soroban-coinflip-game/design.md

Implementation steps:

• Define endpoints and request-response shapes
• Document trust boundaries with the contract
• Keep the API surface minimal and auditable

Branch: feature/backend-api-spec

Example commit message

docs: define backend api spec for tossd game orchestration

Acceptance Criteria

• Run reviews
• Cover edge cases
• Include API notes and security assumptions

Guidelines

• Assignment required before starting
• PR description must include: Closes #160

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