feat: v0.2.1 — fix encryption, diverse multi-topic generation, UX fixes

- Rewrite encryption with "enc:" prefix to permanently eliminate
  the double-encryption bug on settings save
- Add one-time migration to clear legacy non-prefixed encrypted values
- Rewrite content analyzer prompts to request N distinct diverse topics
  across 5 categories (question, complaint, comparison, news, guide)
- Pass target_count*2 from pipeline to analyzer for headroom
- Add skip_dedup flag so manual Generate Now always produces content
- Generate Now button now sends force=1 to clear stale locks
- Rename OpenRouter provider files to PSR-4 convention (hyphenated)
- Switch default models to google/gemini-2.5-flash-lite
- Clean up reddit_debug log channel to standard 'reddit'
- Bump version to 0.2.1

Cost: ~$0.003/article with Gemini 2.0 Flash, ~34s pipeline.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

prautoblogger.php

@@ -35,7 +35,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 | and limits without magic strings.
 */
 
-define( 'PRAUTOBLOGGER_VERSION', '0.2.0' );
+define( 'PRAUTOBLOGGER_VERSION', '0.2.1' );
 define( 'PRAUTOBLOGGER_DB_VERSION', '1.1.0' );
 define( 'PRAUTOBLOGGER_PLUGIN_FILE', __FILE__ );
 define( 'PRAUTOBLOGGER_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
@@ -49,9 +49,9 @@ define( 'PRAUTOBLOGGER_API_TIMEOUT_SECONDS', 120 );
 define( 'PRAUTOBLOGGER_CACHE_TTL_SECONDS', 3600 );
 
 // Default models for OpenRouter (user can override in settings).
-define( 'PRAUTOBLOGGER_DEFAULT_ANALYSIS_MODEL', 'anthropic/claude-3.5-haiku' );
-define( 'PRAUTOBLOGGER_DEFAULT_WRITING_MODEL', 'anthropic/claude-sonnet-4' );
-define( 'PRAUTOBLOGGER_DEFAULT_EDITOR_MODEL', 'anthropic/claude-sonnet-4' );
+define( 'PRAUTOBLOGGER_DEFAULT_ANALYSIS_MODEL', 'google/gemini-2.5-flash-lite' );
+define( 'PRAUTOBLOGGER_DEFAULT_WRITING_MODEL', 'google/gemini-2.5-flash-lite' );
+define( 'PRAUTOBLOGGER_DEFAULT_EDITOR_MODEL', 'google/gemini-2.5-flash-lite' );
 
 /*
 |--------------------------------------------------------------------------