implements full blocks support with:
- block_types: create, filter, get by slug, update
- block_schemas: create, filter, get by checksum/id (server-side sha256 checksum)
- block_documents: create, filter, get, update, delete

uses std.json.Stringify streaming pattern for json serialization.
health endpoint now returns "ok" (text/plain) to match python server.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- move uuid functions to utilities/uuid.zig
- move timestamp functions to utilities/time.zig
- create api/routing.zig for path extraction and run name generation
- rename extractIdSimple to extractIdAfter (actually describes what it does)
- delete common.zig

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- implement POST /flows/filter and POST /task_runs/filter endpoints
- split db/sqlite.zig into domain modules (flows, flow_runs, task_runs, events)
to respect 500 line limit per file
- move messaging.zig from events/ to utilities/ to match prefect structure
- consolidate test scripts in scripts/ with descriptive names:
- test-flow: SDK integration test
- test-api-sequence: comprehensive HTTP API test
- test-events-subscribe: websocket subscription test
- test-events-sdk: events with SDK test
- test-websocket: websocket ping/pong test
- convert all scripts to uv inline script metadata format
- update CLAUDE.md and ROADMAP.md

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- events/ for event system (messaging)
- orchestration/ for state transition logic
- main.zig as only root module (besides logging.zig utility)

mirrors python prefect server layout

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

was an old std.http implementation, replaced by zap. not imported anywhere.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>