refactor(server): canonicalize service API

[thdxr]

Summary

• promote the experimental server API to canonical names and organize route groups, handlers, authorization, and session-location middleware around complete service layers
• standardize core default layers and replayable state updates, and make CLI daemon startup work for both source and compiled entrypoints
• derive TUI diff hunk offsets from patch content after the OpenTUI method removal

Testing

• bun turbo typecheck
• bun test test/agent.test.ts test/plugin.test.ts test/session-runner.test.ts test/system-context/registry.test.ts test/tool-grep.test.ts test/tool-webfetch.test.ts test/tool-websearch.test.ts in packages/core
• bun test test/session/compaction.test.ts test/session/prompt.test.ts in packages/opencode
• bun test test/server/httpapi-authorization.test.ts test/server/httpapi-query-schema-drift.test.ts in packages/opencode
• bun test test/cli/tui/diff-viewer.test.tsx in packages/opencode

[greptile-apps]

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