refactor: convert guru-rmm to git submodule (gururmm Gitea repo)

Removes the stale copy of gururmm source from claudetools tracking and
replaces it with a submodule pointing to the live gururmm Gitea repo.
Fixes context drift between session logs and actual codebase state.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

projects/msp-tools/guru-rmm/server/migrations/003_extended_metrics.sql

@@ -1,34 +0,0 @@
--- Extended metrics and agent state
--- Adds columns for uptime, user info, IPs, and network state storage
-
--- Add extended columns to metrics table
-ALTER TABLE metrics ADD COLUMN IF NOT EXISTS uptime_seconds BIGINT;
-ALTER TABLE metrics ADD COLUMN IF NOT EXISTS boot_time BIGINT;
-ALTER TABLE metrics ADD COLUMN IF NOT EXISTS logged_in_user VARCHAR(255);
-ALTER TABLE metrics ADD COLUMN IF NOT EXISTS user_idle_seconds BIGINT;
-ALTER TABLE metrics ADD COLUMN IF NOT EXISTS public_ip VARCHAR(45);  -- Supports IPv6
-
--- Agent state table for current/latest agent information
--- This stores the latest snapshot of extended agent info (not time-series)
-CREATE TABLE IF NOT EXISTS agent_state (
-    agent_id UUID PRIMARY KEY REFERENCES agents(id) ON DELETE CASCADE,
-    -- Network state
-    network_interfaces JSONB,
-    network_state_hash VARCHAR(32),
-    -- Latest extended metrics (cached for quick access)
-    uptime_seconds BIGINT,
-    boot_time BIGINT,
-    logged_in_user VARCHAR(255),
-    user_idle_seconds BIGINT,
-    public_ip VARCHAR(45),
-    -- Timestamps
-    network_updated_at TIMESTAMPTZ,
-    metrics_updated_at TIMESTAMPTZ DEFAULT NOW()
-);
-
--- Index for finding agents by public IP (useful for diagnostics)
-CREATE INDEX IF NOT EXISTS idx_agent_state_public_ip ON agent_state(public_ip);
-
--- Add memory_total_bytes and disk_total_bytes to metrics for completeness
-ALTER TABLE metrics ADD COLUMN IF NOT EXISTS memory_total_bytes BIGINT;
-ALTER TABLE metrics ADD COLUMN IF NOT EXISTS disk_total_bytes BIGINT;