Implement MCP automation and approvals.

crates/bds-core/migrations/2026-07-19-123029-0000_add_mcp_proposals/down.sql

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+DROP TABLE mcp_proposals;

crates/bds-core/migrations/2026-07-19-123029-0000_add_mcp_proposals/up.sql

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+CREATE TABLE mcp_proposals (
+    id TEXT PRIMARY KEY NOT NULL,
+    project_id TEXT NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
+    kind TEXT NOT NULL CHECK (kind IN (
+        'draft_post',
+        'propose_script',
+        'propose_template',
+        'propose_media_translation',
+        'propose_media_metadata',
+        'propose_post_metadata'
+    )),
+    status TEXT NOT NULL DEFAULT 'pending' CHECK (status IN (
+        'pending', 'executing', 'accepted', 'rejected', 'expired'
+    )),
+    entity_id TEXT,
+    data TEXT NOT NULL,
+    result TEXT,
+    created_at BIGINT NOT NULL,
+    expires_at BIGINT NOT NULL,
+    resolved_at BIGINT
+);
+
+CREATE INDEX mcp_proposals_project_status_idx
+    ON mcp_proposals(project_id, status, created_at);