Misc optimization

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[Copilot]

Pull request overview

This PR focuses on small performance/cleanup optimizations across the backend, mainly by reducing repeated global lookups, tightening some parsing logic, and simplifying response streaming paths.

Changes:

• Refactor global mutable state from a single mutable object into dedicated live bindings (mutableDatabase, mutableHttpServer, mutableRootId) initialized via setters.
• Micro-optimize hashing/token parsing (reuse ASCII85 options, avoid split() allocations).
• Simplify document read endpoints by returning the ReadableStream directly via ctx.body(...) instead of hono/streaming.

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/global.ts	Replaces mutable object with mutableDatabase/mutableHttpServer/mutableRootId and setter functions.
src/init.ts	Initializes the new globals via setters; computes and stores mutableRootId after migrations.
src/utils/document.ts	Uses mutableDatabase and cached mutableRootId for name generation / ownership checks.
src/utils/crypto.ts	Reuses ASCII85 options and avoids string splitting in verifyHash.
src/http/middleware/authorization.ts	Avoids split(".") and swaps to mutableDatabase access.
src/tasks/list/sweeper.ts	Uses mutableRootId and hoists env-derived age computations out of the loop.
src/http/handler.ts	Switches Cache-Control mutation from append to set.
src/endpoints/**	Mechanical updates to use mutableDatabase; some document endpoints return ReadableStream directly.
src/database/migration.ts	Updates global access usage inside a migration hook (see review comments).
src/database/index.ts	Replaces savepoint name generation with an incrementing counter; adds savepointId.

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