Play Framework

feat: 14 new plugin tasks + scaffold UX + -P override semantics (PF-90)

Brings the Gradle plugin to feature parity with the python CLI for
all commands the user has flagged as needed. Plugin file grew from
~480 to ~1245 lines; user-facing task count went from 6 to 20.

Scaffold UX (build.gradle.kts):
- playNewApp -Pdest now optional, defaults to <cwd>/<name> mirroring
  python's cwd-relative \`play new myapp\` behavior
- Generated build.gradle.kts defaults to modules(\"docviewer\") so the
  framework welcome page renders correctly (matches python's auto-add
  of docviewer in dev mode)
- New -Pfrontend flag scaffolds the Nuxt 3 frontend at <app>/frontend/,
  moves ApiController.java into app/controllers/, patches conf/routes
  with /api/status, mirrors python's setup_nuxt_frontend exactly

Command parity (Play1Plugin.kt):
- playSecret: rotate the application secret in certs/.env
- playClean: delete tmp/
- playEvolutions [-Pmode=apply|resolve|markApplied]: DB schema runner
- playVersion, playClasspath: inspection tools
- playEnableHttps [-Pregenerate], playDisableHttps: TLS cert lifecycle
  (mkcert preferred, openssl fallback; respects user customizations
  via the comment/uncomment-only contract from the python)
- playStart/Stop/Restart/Pid/Out/Status: daemon control via
  ProcessHandle (Java 9+) and ProcessBuilder
- playJavadoc [-Plinks]: javadoc with module sources included
- playModulesInfo: mirror of python's \`play modules\` listing
- -Poutput flag on playDist for custom zip output path

Plugin-level architecture changes:
- ext.playId / ext.httpPort now honor -PplayId / -PhttpPort via
  afterEvaluate. Precedence: -P > DSL set > convention default.
  Matches python's --option > conf precedence.
- Refactored playClasspathFor() helper used by all JVM tasks
  (playRun/Test/Precompile + playStart/Restart + playAutotest
  + playJavadoc + playClasspath) -- eliminates duplication
- Hoisted loadDotEnv to top-level fn for reuse across tasks
- registerPlayJvmTask gained a mainClass parameter so playEvolutions
  can use play.db.Evolutions instead of play.server.Server
- Added missing dependsOn(\"extractPlayModules\") to playStart,
  playRestart, playJavadoc -- without it, modules wouldn't be on disk
  before the JVM started, causing the welcome page to render with
  broken docviewer-served assets

Intentionally skipped python commands: antify (Ant world is gone),
id (per-checkout id file edge case), check (release-feed nag for
upstream playframework.com), idealize (IntelliJ Gradle import
handles), modulesrepo (playframework.com module repo, fork doesn't
use).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>