refactor: large codebase cleanup - consolidate schemas, migrate to Drizzle ORM, extract frontend components, modernize Docker builds

- Consolidate all DB schema definitions into packages/shared as single source of truth
- Migrate backend from raw SQL to Drizzle ORM across all modules
- Extract frontend inline UI into separate component files
- Refactor discord-gateway circuitBreaker into conversationState + moderationState
- Convert messageStore to Proxy singleton pattern
- Add validateBody/validateQuery middleware + Zod schemas for API endpoints
- Modernize Docker builds with multi-stage + pnpm deploy
- Migrate CI/CD from deployment to image-based pipeline
- Remove 60+ unused/dead files (~15K lines)
- Update color scheme from sky-blue to teal-cyan
- Move DB connection management to @bete/shared/database

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

services/discord-gateway/src/modules/message-capture/messagesPagination.ts

@@ -0,0 +1,107 @@
+import { buildCursorCondition, pageResult } from "@bete/shared";
+import { createChildLogger, type Logger } from "@bete/shared/logger";
+import { and, desc, eq, inArray, type SQL, sql } from "drizzle-orm";
+import type { NodePgDatabase } from "drizzle-orm/node-postgres";
+import type * as schema from "../../shared/database/schema.js";
+import { messagesTable } from "../../shared/database/schema.js";
+import type {
+  MessageQuery,
+  MessageRecord,
+  PageResult,
+} from "../message-capture/types.js";
+import { channelOrThreadCondition } from "./messagesCrud.js";
+
+// ─── Helpers ──────────────────────────────────────────────────────────────────
+
+export function buildListMessageConditions(query: MessageQuery): SQL[] {
+  const conditions: SQL[] = [];
+
+  if (query.guildId) {
+    conditions.push(eq(messagesTable.guild_id, query.guildId));
+  }
+
+  if (query.channelId) {
+    conditions.push(channelOrThreadCondition(query.channelId));
+  }
+
+  if (query.threadId) {
+    conditions.push(eq(messagesTable.thread_id, query.threadId));
+  }
+
+  if (query.userId) {
+    conditions.push(eq(messagesTable.user_id, query.userId));
+  }
+
+  if (query.status && query.status.length > 0) {
+    conditions.push(
+      inArray(
+        messagesTable.ai_status,
+        query.status as Array<
+          "pending" | "processing" | "clean" | "warn" | "flagged" | "error"
+        >,
+      ),
+    );
+  }
+
+  if (query.q) {
+    const pattern = `%${query.q.toLowerCase()}%`;
+    conditions.push(sql`lower(${messagesTable.content}) like ${pattern}`);
+  }
+
+  const cursorCondition = buildCursorCondition(
+    messagesTable.created_at,
+    messagesTable.id,
+    query.cursor,
+  );
+  if (cursorCondition) {
+    conditions.push(cursorCondition);
+  }
+
+  return conditions;
+}
+
+// ─── MessagesPagination Class ────────────────────────────────────────────────
+
+export class MessagesPagination {
+  private logger: Logger;
+
+  constructor(
+    private db: NodePgDatabase<typeof schema>,
+    _parentLogger?: Logger,
+  ) {
+    this.logger = createChildLogger("messages-pagination");
+  }
+
+  async listMessages(query: MessageQuery): Promise<PageResult<MessageRecord>> {
+    this.logger.debug({ query }, "listMessages entry");
+    try {
+      const conditions = buildListMessageConditions(query);
+      const rows = await this.db
+        .select()
+        .from(messagesTable)
+        .where(conditions.length > 0 ? and(...conditions) : undefined)
+        .orderBy(desc(messagesTable.created_at), desc(messagesTable.id))
+        .limit(query.limit + 1);
+
+      return pageResult<MessageRecord>(rows, query.limit);
+    } catch (error) {
+      this.logger.error(
+        {
+          query,
+          error: error instanceof Error ? error.message : String(error),
+        },
+        "Failed to list messages",
+      );
+      throw error;
+    }
+  }
+
+  async listReviewMessages(
+    query: Omit<MessageQuery, "status">,
+  ): Promise<PageResult<MessageRecord>> {
+    return this.listMessages({
+      ...query,
+      status: ["warn", "flagged", "error"],
+    });
+  }
+}