Add subreddit tone profiles for message style guidance

Introduces a tone-profile system that lets the processor adapt outgoing
message style per-subreddit (and per-flair) instead of using one tone
for everything. Profiles act as a "tone mic" layered after the base
prompt and strategy override, so they shape voice without redefining
the whole message.

- src/config/tone-profiles.ts defines the catalog (default, dominant,
  submissive, playful, direct, ...) and a resolveTone() helper that
  falls back to the default profile for unknown keys.
- config.yaml maps subreddits to tone keys; the schema in
  src/config/index.ts validates it.
- src/services/processor.ts threads the resolved tone into the prompt
  build, picking based on subreddit and optional link flair.
- src/reddit/api.ts adds link_flair_text to RedditPost so the
  processor can use it for tone selection.
- src/ai/openrouter.ts accepts and forwards the tone-shaped prompt.
- public/index.html surfaces the active tone in the dashboard.
- Tests cover the catalog, config validation, and processor integration.

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

src/config/index.ts

@@ -3,6 +3,7 @@ import fs from 'fs';
 import path from 'path';
 import YAML from 'yaml';
 import dotenv from 'dotenv';
+import { TONE_KEYS } from './tone-profiles.js';
 
 dotenv.config();
 
@@ -10,6 +11,8 @@ export const SubredditConfigSchema = z.object({
   name: z.string(),
   type: z.enum(['image', 'chat']).default('image'),
   weight: z.number().positive().optional(),
+  tone: z.enum(TONE_KEYS).default('default'),
+  scripted: z.string().optional(),
 });
 
 export type SubredditConfig = z.infer<typeof SubredditConfigSchema>;