build: produce the whole site from one Vite build

The four build variants existed only because the app could not resolve its own
dataset. Now that it can, vite.config.js is a single build with an absolute
base and no VARIANT switching, and the workflow compiles Rust once, installs
Node dependencies once, and builds the site once — it previously built the same
Rust crate twice and ran two separate pnpm installs.

Because base is absolute, the emitted index.html references /thptqg/assets/...
regardless of where it is served from, so the same file works as an entry point
at any depth. scripts/assemble-site.js copies it to each dataset path and to
the two legacy nested URLs, giving a real static file at every published route.
That is what removes the need for an SPA 404-fallback redirect, which would
otherwise have rewritten URLs and interfered with the ?q= deep links.

Generated databases move to a gitignored .build/public, which Vite consumes as
its publicDir. build-db.js gzips without -k, and the assemble step then refuses
to finish if any uncompressed database artefact reached the output — .db,
.db-journal, .db-wal or .db-shm. Previously a raw 100+ MB database was written
into the source tree and deleted afterwards by an rm in the workflow, so
shipping one was a missing cleanup step away.

Both build scripts import DATASET_IDS from src/datasets.js rather than
repeating the dataset list in workflow shell, so the four ids are declared in
exactly one place across the frontend, the database build and the assembly.

Verified by running the full pipeline locally and serving the artifact over
HTTP: all nine routes return 200, every entry point is byte-identical, asset
references are absolute, and the databases are fetchable. The guard was tested
by injecting a raw .db and .db-journal into the build, which failed the
assembly as intended.

.github/workflows/deploy-pages.yml

@@ -24,57 +24,29 @@ jobs:
 
       - uses: Swatinem/rust-cache@v2
         with:
-          workspaces: |
-            2016/tools/xlsxread
-            2017/tools/xlsxread
-
-      - uses: pnpm/action-setup@v4
-        with:
-          package_json_file: 2017/package.json
+          workspaces: parser
 
       - uses: actions/setup-node@v4
         with:
           node-version: '24'
-          cache: 'pnpm'
-          cache-dependency-path: |
-            2016/pnpm-lock.yaml
-            2017/pnpm-lock.yaml
+          cache: 'npm'
+          cache-dependency-path: package-lock.json
 
-      - name: Build 2016 site
-        working-directory: '2016'
-        run: |
-          set -euo pipefail
-          cargo build --release --manifest-path tools/xlsxread/Cargo.toml
-          ./tools/xlsxread/target/release/xlsxread build \
-            --schema tools/xlsxread/configs/thptqg2016-data.toml \
-            --input data --output public/thptqg2016.db
-          pnpm install --frozen-lockfile
-          gzip -k -9 public/thptqg2016.db
-          pnpm build
-          rm -f dist/thptqg2016.db
+      - run: npm ci
 
-      - name: Build 2017 site variants
-        working-directory: '2017'
+      # One parser binary builds every dataset; build-db.js reads the dataset
+      # list from src/datasets.js and gzips each database in place, leaving no
+      # uncompressed file behind.
+      - name: Build databases
         run: |
-          set -euo pipefail
-          cargo build --release --manifest-path tools/xlsxread/Cargo.toml
-          ./tools/xlsxread/target/release/xlsxread build --schema tools/xlsxread/configs/thptqg2017-data.toml --input data --output public/thptqg2017.db
-          ./tools/xlsxread/target/release/xlsxread build --schema tools/xlsxread/configs/thptqg2017-data-old.toml --input data-old --output public-old/thptqg2017.db
-          ./tools/xlsxread/target/release/xlsxread build --schema tools/xlsxread/configs/thptqg2017-data-old2.toml --input data-old2 --output public-old2/thptqg2017.db
-          pnpm install --frozen-lockfile
-          gzip -kf -9 public/thptqg2017.db
-          gzip -kf -9 public-old/thptqg2017.db
-          gzip -kf -9 public-old2/thptqg2017.db
-          pnpm build:all
-          rm -f dist/thptqg2017.db dist/old/thptqg2017.db dist/old2/thptqg2017.db
+          npm run build:rust
+          npm run build:db
 
-      - name: Assemble site
-        run: |
-          set -euo pipefail
-          mkdir -p _site
-          cp index.html _site/
-          cp -r 2016/dist _site/2016
-          cp -r 2017/dist _site/2017
+      # One Vite build produces every page. scripts/assemble-site.js copies the
+      # emitted index.html to each dataset path (and the legacy nested URLs),
+      # then fails the job if any uncompressed database reached the artifact.
+      - name: Build and assemble site
+        run: npm run build:site
 
       - uses: actions/upload-pages-artifact@v3
         with: