refactor(main): modularize runtime and harden anilist setup flow

docs/subagents/agents/codex-config-validation-20260219T172015Z-iiyf.md

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+# Agent Log
+
+- agent_id: `codex-config-validation-20260219T172015Z-iiyf`
+- alias: `codex-config-validation`
+- mission: `Find root cause of config validation error for ~/.config/SubMiner/config.jsonc`
+- status: `completed`
+- last_update_utc: `2026-02-19T17:26:17Z`
+
+## Intent
+
+- inspect validation code path + expected schema
+- inspect user config values
+- map failing field/type; report exact issue
+
+## Planned Files
+
+- `~/.config/SubMiner/config.jsonc`
+- `src/**` (validation/schema)
+
+## Assumptions
+
+- config error produced by current repo binary/schema
+- user wants diagnosis only; no edits unless asked
+
+## Run Notes
+
+- phase: `inspect -> reproduce -> handoff`
+- strict parse: ok (`reloadConfigStrict` succeeded)
+- warnings:
+  - `ankiConnect.openRouter` deprecated; use `ankiConnect.ai`
+  - `ankiConnect.isLapis.sentenceCardSentenceField` deprecated; fixed internal value
+  - `ankiConnect.isLapis.sentenceCardAudioField` deprecated; fixed internal value
+
+## Handoff
+
+- touched files: `docs/subagents/INDEX.md`, `docs/subagents/agents/codex-config-validation-20260219T172015Z-iiyf.md`, `src/main/config-validation.ts`, `src/main/runtime/startup-config.ts`, `src/core/services/config-hot-reload.ts`, `src/main.ts`, `src/main/config-validation.test.ts`, `src/main/runtime/startup-config.test.ts`, `src/core/services/config-hot-reload.test.ts`
+- key decision: report warnings as likely user-visible "config validation issue(s)" root cause; then implement detailed warning bodies for startup + hot-reload notifications
+- blocker: none
+- next step: optional tune max-lines/format for notification bodies