refactor: architecture base

- Moved NodeCG context management to a dedicated context module.
- Introduced message handling utilities for better message listening and sending.
- Updated startgg integration to use new message handling methods.
- Removed deprecated replicant utilities and replaced them with a new structure.
- Refactored replicant imports in graphics components to align with new structure.
- Added new pack-related types and schemas for better type safety.
- Cleaned up unused files and consolidated pack configuration into a single module.
- Updated TypeScript configurations to reflect new directory structure.

docs/refactor/PHASE_1_SUMMARY.md

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+# Phase 1 Summary
+
+## Scope
+
+Executed the base architecture phase only. This phase focused on structure, boundaries, shared contracts and compatibility without changing UX, overlay visuals or large feature logic.
+
+## Completed
+
+- Added the `src/nodecg` boundary:
+  - `src/nodecg/browser`
+  - `src/nodecg/extension`
+  - centralized `replicantNames`
+  - centralized `messageNames`
+- Moved browser replicant access out of `src/browser_shared`.
+- Moved dashboard stores to `src/dashboard/stores`.
+- Moved pure country helpers to `src/shared/domain/players`.
+- Moved pack config and pack types to `src/shared/domain/packs`.
+- Added pack replicant schemas:
+  - `installedPacks`
+  - `packRegistry`
+  - `downloadStates`
+  - `availableUpdates`
+- Added generated TypeScript declarations for the new pack schemas.
+- Removed dead example code:
+  - `exampleReplicant` schema/type
+  - `ExampleType`
+  - `src/extension/example.ts`
+- Removed redundant stale JS files from `src/shared`.
+- Updated extension bootstrap to use an explicit NodeCG context boundary.
+- Routed browser messages through `src/nodecg/browser/messages.ts`.
+- Routed extension message registration through `src/nodecg/extension/messages.ts`.
+- Routed pack replicant creation through NodeCG pack boundary services.
+- Updated build config so generated NodeCG/shared extension outputs are ignored and cleaned.
+
+## Preserved
+
+- No overlay UX, CSS, SVG, layout or animation logic was intentionally changed.
+- No large dashboard view was split or rewritten.
+- `pack-manager.ts` behavior was preserved; only imports, types, replicant/message names and boundaries were normalized.
+- Public NodeCG message names were kept unchanged for compatibility.
+- Public replicant names and defaults were kept unchanged.
+
+## Verification
+
+- `pnpm.cmd exec vue-tsc -p tsconfig.browser.json --noEmit`: passed.
+- `pnpm.cmd exec tsc -b tsconfig.extension.json --pretty false`: passed.
+- `pnpm.cmd exec eslint`: passed with 0 errors and existing Vue formatting warnings.
+- `pnpm.cmd run build`: passed.
+
+## Remaining For Later Phases
+
+- Controlled rewrite of `pack-manager.ts`.
+- Controlled rewrite of `usePackRegistry` and `fighting-characters.ts`.
+- Formal provider module split for Start.gg and Challonge.
+- Splitting `Players.vue` and `Settings.vue`.
+- Overlay view models and visual baseline work.