Implement real-time process monitoring and fix UI hardcoded data

This commit addresses several key issues identified during development:

Major Changes:
- Replace hardcoded top CPU/RAM process display with real system data
- Add intelligent process monitoring to CpuCollector using ps command
- Fix disk metrics permission issues in systemd collector
- Optimize service collection to focus on status, memory, and disk only
- Update dashboard widgets to display live process information

Process Monitoring Implementation:
- Added collect_top_cpu_process() and collect_top_ram_process() methods
- Implemented ps-based monitoring with accurate CPU percentages
- Added filtering to prevent self-monitoring artifacts (ps commands)
- Enhanced error handling and validation for process data
- Dashboard now shows realistic values like "claude (PID 2974) 11.0%"

Service Collection Optimization:
- Removed CPU monitoring from systemd collector for efficiency
- Enhanced service directory permission error logging
- Simplified services widget to show essential metrics only
- Fixed service-to-directory mapping accuracy

UI and Dashboard Improvements:
- Reorganized dashboard layout with btop-inspired multi-panel design
- Updated system panel to include real top CPU/RAM process display
- Enhanced widget formatting and data presentation
- Removed placeholder/hardcoded data throughout the interface

Technical Details:
- Updated agent/src/collectors/cpu.rs with process monitoring
- Modified dashboard/src/ui/mod.rs for real-time process display
- Enhanced systemd collector error handling and disk metrics
- Updated CLAUDE.md documentation with implementation details

dashboard/Cargo.toml

@@ -4,18 +4,17 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-cm-dashboard-shared = { path = "../shared" }
-ratatui = "0.24"
-crossterm = "0.27"
-tokio = { version = "1.0", features = ["full"] }
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-clap = { version = "4.0", features = ["derive"] }
-anyhow = "1.0"
-chrono = { version = "0.4", features = ["serde"] }
-toml = "0.8"
-tracing = "0.1"
-tracing-subscriber = { version = "0.3", features = ["fmt", "env-filter"] }
-tracing-appender = "0.2"
-zmq = "0.10"
-gethostname = "0.4"
+cm-dashboard-shared = { workspace = true }
+tokio = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+anyhow = { workspace = true }
+chrono = { workspace = true }
+clap = { workspace = true }
+zmq = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
+ratatui = { workspace = true }
+crossterm = { workspace = true }
+toml = { workspace = true }