feat: adopt per-bot account api key for gateway attribution and improve post distinctness

- Add `account_api_key` field to `BotState` and `_adopt_account_api_key()` method that fetches the bot's own `users.api_key` from its profile JSON after auth, switching `LLMClient` to use it instead of the shared bootstrap key, routing gateway spend through the bot's user identity
- Replace `interleave_by_author` with a simpler greedy algorithm that picks the first row whose owner differs from the last picked, removing the multi-queue priority logic
- Extend `_ai_quota` response with `unlimited`, `requests`, and `last_used` fields sourced from new `user_spend_24h()` analytics helper
- Pass `recent_post_titles` from `BotState` into `LLMClient.generate_post()` and add a `distinct_rule` prompt instructing the model to avoid repeating framing, examples, or opinions from the bot's last six posts
- Remove early-return dedup check in `ArticleRegistry.admit` that skipped articles already held by the same bot owner, allowing re-admission under a different category
- Render bot username as a clickable link with avatar in the admin bots table

devplacepy/services/bot/llm.py

@@ -5,7 +5,7 @@ import logging
 import random
 import re
 import time
-from typing import Any
+from typing import Any, Optional
 
 import httpx
 
@@ -156,7 +156,12 @@ class LLMClient:
         return text.strip()
 
     def generate_post(
-        self, title: str, desc: str, persona: str = "", category: str = ""
+        self,
+        title: str,
+        desc: str,
+        persona: str = "",
+        category: str = "",
+        recent_titles: Optional[list[str]] = None,
     ) -> str:
         persona_extras = {
             "enthusiastic_junior": "Be excited. Use **bold** for emphasis. Short excited sentences. End with a question sometimes.",
@@ -182,6 +187,15 @@ class LLMClient:
             else " Be casual. No markdown."
         )
         category_extra = f" {category_extras.get(category, '')}" if category else ""
+        distinct_rule = ""
+        if recent_titles:
+            recent = "; ".join(t for t in recent_titles[-6:] if t)
+            if recent:
+                distinct_rule = (
+                    f" You already posted about: {recent[:600]}. Take a completely "
+                    "different angle from those and do not repeat their framing, "
+                    "examples, or opinions."
+                )
         preserve = persona in (
             "enthusiastic_junior",
             "hobbyist_maker",
@@ -193,7 +207,8 @@ class LLMClient:
             f"You are a dev writing a social media post reacting to tech news. Write 2-4 short paragraphs."
             f"{persona_extra}{category_extra} Do not summarize the article; assume the reader already saw it. "
             f"Add your own value: a concrete opinion, an implication, a personal experience, or a pointed question. "
-            f"Reference a specific detail rather than restating the headline. No em dashes. Under 300 words.",
+            f"Reference a specific detail rather than restating the headline. No em dashes. Under 300 words."
+            f"{distinct_rule}",
             f"News: {title}\n\n{desc[:800]}",
         )
         return self.clean(text, preserve_md=preserve)