feat(mcpedia): Phase 1 MVP — monorepo, Core, Web UI, MCP server, Postgres FTS

- bun workspaces + Turborepo monorepo (apps/web, apps/mcp; packages/*, scripts)
- @mcpedia/core single business-logic layer (Document/Content/Search services)
- @mcpedia/db Drizzle schema: documents + weighted tsvector (GIN) for FTS
- @mcpedia/parser frontmatter, @mcpedia/search Postgres FTS (ts_rank+ts_headline)
- Next.js 16 Web UI (home/doc SSG, search dynamic) + react-markdown render
- MCP server (stdio) with 4 tools + in-memory smoke test
- scripts/indexer walks content/ -> upserts into Postgres
- 4 seed docs; README + PHASES status

packages/db/drizzle/0000_grey_toro.sql

@@ -0,0 +1,19 @@
+CREATE TABLE "documents" (
+	"id" text PRIMARY KEY NOT NULL,
+	"slug" text NOT NULL,
+	"title" text NOT NULL,
+	"type" text NOT NULL,
+	"section" text NOT NULL,
+	"status" text DEFAULT 'published' NOT NULL,
+	"author" text DEFAULT '' NOT NULL,
+	"tags" text[] DEFAULT '{}' NOT NULL,
+	"path" text NOT NULL,
+	"body" text DEFAULT '' NOT NULL,
+	"search_vector" "tsvector" GENERATED ALWAYS AS (setweight(to_tsvector('simple', coalesce("documents"."title", '')), 'A') || setweight(to_tsvector('simple', coalesce("documents"."body", '')), 'B')) STORED NOT NULL,
+	"created_at" timestamp with time zone NOT NULL,
+	"updated_at" timestamp with time zone NOT NULL,
+	CONSTRAINT "documents_slug_unique" UNIQUE("slug")
+);
+--> statement-breakpoint
+CREATE INDEX "documents_search_idx" ON "documents" USING gin ("search_vector");--> statement-breakpoint
+CREATE INDEX "documents_section_idx" ON "documents" USING btree ("section");