Modernize for Deno 2: drop kv_insights, migrate kv_oauth + std to JSR

- Drop `kv_insights` plugin (beta, Fresh-1-only admin convenience):
  remove the plugin registration in main.ts, delete `routes/kv-insights/`,
  delete the three islands that only re-exported its UI.
- Migrate `kv_oauth` from `deno.land/x/deno_kv_oauth@v0.10.0` to
  `jsr:@deno/kv-oauth@^0.11`. API surface is unchanged; only the
  `kv_oauth/mod.ts` subpath import sites needed updating to `kv_oauth`.
- Migrate every `std/` import to scoped `@std/*` JSR packages
  (`@std/assert`, `@std/http`, `@std/collections`, `@std/ulid`,
  `@std/datetime`, `@std/dotenv`).
- `deno.json`: add `"nodeModulesDir": "none"` to be explicit about the
  npm-specifier-without-node_modules setup (silences the Deno 2 default
  change), drop `"lock": false` so Deno 2 manages and we commit
  `deno.lock`.
- Regenerate `fresh.gen.ts` to drop the removed kv-insights route and
  islands; rebuild `static/styles.gen.css`.

All 12 unit/integration tests still pass; production build succeeds;
preview server returns 200 for /, /signin, /about. Still on Fresh 1.7.3
— framework upgrade is the next commit.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: kevingorski

deno.json

@@ -6,17 +6,20 @@
     "@/": "./",
     "$fresh/": "https://deno.land/x/fresh@1.7.3/",
     "$gfm": "https://deno.land/x/gfm@0.2.4/mod.ts",
+    "@std/assert": "jsr:@std/assert@^1.0",
+    "@std/collections": "jsr:@std/collections@^1.1",
+    "@std/datetime": "jsr:@std/datetime@^0.225",
+    "@std/dotenv": "jsr:@std/dotenv@^0.225",
+    "@std/http": "jsr:@std/http@^1.1",
+    "@std/ulid": "jsr:@std/ulid@^1.0",
     "basic_auth": "https://deno.land/x/basic_auth@v1.1.1/mod.ts",
     "browserslist": "npm:browserslist@^4.24.4",
     "case": "https://deno.land/x/case@2.1.1/mod.ts",
     "chart.js": "https://esm.sh/stable/chart.js@4.3.0/auto?target=es2022",
     "countries": "https://deno.land/x/countries@v1.1.2/mod.ts",
     "fast-blurhash": "npm:fast-blurhash@^1.1.4",
     "gravatar": "npm:gravatar@^1.8.2",
-    "kv_insights": "https://deno.land/x/deno_kv_insights@v0.8.4-beta/mod.ts",
-    "kv_insights/": "https://deno.land/x/deno_kv_insights@v0.8.4-beta/",
-    "kv_oauth": "https://deno.land/x/deno_kv_oauth@v0.10.0/mod.ts",
-    "kv_oauth/": "https://deno.land/x/deno_kv_oauth@v0.10.0/",
+    "kv_oauth": "jsr:@deno/kv-oauth@^0.11",
     "lightningcss": "npm:lightningcss@^1.29.1",
     "marked": "npm:marked@^15.0.6",
     "preact": "https://esm.sh/preact@10.22.0",
@@ -27,11 +30,10 @@
     "react": "https://esm.sh/preact@10.19.2/compat",
     "react-dom": "https://esm.sh/preact@10.19.2/compat",
     "react/jsx-runtime": "https://esm.sh/preact@10.19.2/compat",
-    "std/": "https://deno.land/std@0.208.0/",
     "stripe": "./stripe.ts"
   },
   "lint": { "rules": { "tags": ["fresh", "recommended"] } },
-  "lock": false,
+  "nodeModulesDir": "none",
   "pkgx": "deno.land^2.1.1 github.com/evilmartians/lefthook^1.5.0",
   "tasks": {
     "db:dump": "deno run --allow-read --allow-env tools/dump_kv.ts",