refactor(gui): move the snapshot-store engine into the client runtime

The data layer no longer depends on the React glue package, and business
plugins no longer depend on web-react at all:

- The store engine (zustand vanilla + immer + persist + dev freeze),
  defineStore, and shallowEqual move to @deepseek-ai/dsh-client-runtime,
  exported from the ./client main entry — no ./store subpath survives on
  either package (the web-react one is deleted, none is opened on runtime).
- Store products are bare snapshot sources: useSelector leaves
  SnapshotStore/StoreInstance and Session; every hook is composed at the
  binding site in web-react's renderer (per-source cached uSES binding).
  The SlotRendererHost sessions face carries bare observables only.
- SessionProvider becomes a standard-kit seat: an entry whose children
  declare a session-scope slot receives the framework component as a prop,
  retiring the last value import of web-react from plugin packages.
  UseSession and the session-area types now live in ui-slots.
- web-react shrinks to the shell-only React glue (renderer, providers,
  uSES bridge); zustand/immer belong to runtime alone; the module-table
  seed and tsdown externals drop the web-react/store seat.
- NODE_ENV replacement is defined once in the shared tsdown client preset
  (browser bundles inline the engine and lost vite's define); the 3-line
  process.env typecheck shim moves to runtime with the engine.
- Stray tsc artifacts (.js/.d.ts/.d.ts.map beside sources under src/)
  swept repo-wide; they shadow real sources under vitest resolution.

Verified: both aggregate typecheck programs at zero; 604 client tests
green; repo-wide grep for web-react/store at zero; real-host playwright
run 7/7 including persist round-trip.

ci: fix test/docs

pnpm-lock.yaml

@@ -508,9 +508,9 @@ importers:
 
   packages/client/i18n:
     dependencies:
-      '@deepseek-ai/dsh-client-web-react':
+      '@deepseek-ai/dsh-client-runtime':
         specifier: workspace:^
-        version: link:../web-react
+        version: link:../runtime
     devDependencies:
       '@deepseek-ai/dsh-invariants':
         specifier: workspace:^
@@ -527,18 +527,21 @@ importers:
       '@deepseek-ai/dsh-client-ui-slots':
         specifier: workspace:^
         version: link:../ui-slots
-      '@deepseek-ai/dsh-client-web-react':
-        specifier: workspace:^
-        version: link:../web-react
       '@deepseek-ai/dsh-llm':
         specifier: workspace:^
         version: link:../../llm/llm
       '@deepseek-ai/dsh-session':
         specifier: workspace:^
         version: link:../../core/session
+      immer:
+        specifier: ^10.1.1
+        version: 10.2.0
       react:
         specifier: ^18.2.0
         version: 18.3.1
+      zustand:
+        specifier: ~4.4.7
+        version: 4.4.7(@types/react@18.3.31)(immer@10.2.0)(react@18.3.1)
     devDependencies:
       '@deepseek-ai/dsh-invariants':
         specifier: workspace:^
@@ -567,9 +570,6 @@ importers:
       '@deepseek-ai/dsh-client-ui-slots':
         specifier: workspace:^
         version: link:../ui-slots
-      '@deepseek-ai/dsh-client-web-react':
-        specifier: workspace:^
-        version: link:../web-react
       clsx:
         specifier: ^2.0.0
         version: 2.1.1
@@ -595,9 +595,6 @@ importers:
       '@deepseek-ai/dsh-client-ui-slots':
         specifier: workspace:^
         version: link:../ui-slots
-      '@deepseek-ai/dsh-client-web-react':
-        specifier: workspace:^
-        version: link:../web-react
       react:
         specifier: ^18.2.0
         version: 18.3.1
@@ -645,9 +642,6 @@ importers:
       '@deepseek-ai/dsh-client-ui-slots':
         specifier: workspace:^
         version: link:../ui-slots
-      '@deepseek-ai/dsh-client-web-react':
-        specifier: workspace:^
-        version: link:../web-react
       clsx:
         specifier: ^2.0.0
         version: 2.1.1
@@ -691,9 +685,6 @@ importers:
       '@deepseek-ai/dsh-client-ui-conversation':
         specifier: workspace:^
         version: link:../ui-conversation
-      '@deepseek-ai/dsh-client-web-react':
-        specifier: workspace:^
-        version: link:../web-react
       react:
         specifier: ^18.2.0
         version: 18.3.1
@@ -738,9 +729,6 @@ importers:
         specifier: ^18.2.0
         version: 18.3.1(react@18.3.1)
     devDependencies:
-      '@deepseek-ai/dsh-client-ui-layout':
-        specifier: workspace:^
-        version: link:../ui-layout
       '@deepseek-ai/dsh-invariants':
         specifier: workspace:^
         version: link:../../support/invariants
@@ -762,18 +750,12 @@ importers:
       '@deepseek-ai/dsh-client-ui-slots':
         specifier: workspace:^
         version: link:../ui-slots
-      immer:
-        specifier: ^10.1.1
-        version: 10.2.0
       react:
         specifier: ^18.2.0
         version: 18.3.1
       use-sync-external-store:
         specifier: 1.2.0
         version: 1.2.0(react@18.3.1)
-      zustand:
-        specifier: ~4.4.7
-        version: 4.4.7(@types/react@18.3.31)(immer@10.2.0)(react@18.3.1)
     devDependencies:
       '@deepseek-ai/dsh-invariants':
         specifier: workspace:^