feat: add process monitoring to Monitor panel

User asked for process monitoring. Added:

1. core/monitor.py:
- Extended _LINUX_METRICS_SCRIPT with ===PROC=== section
- ps -e -o stat= | awk counts total/running/sleep/disk-sleep/zombie
- ps -eo pid,user,pcpu,pmem,vsz,rss,stat,etimes,times,args
  Uses etimes/times (numeric) instead of start/time (string with
  spaces) to avoid column-shift bugs. awk joins 10th col onwards
  with spaces so comm retains its full command line.
- New empty-dict fields: proc_total, proc_running, proc_sleep,
  proc_disk, proc_zombie, processes
- New processes[] array with full per-process fields

2. ui/widgets.py MonitorPanel:
- New _build_proc_summary() - 4-stat overview card (total/running/
  sleep/zombie, color-coded)
- New _build_proc_table() - 9-column process list with:
    * Search box (multi-keyword AND match across pid/user/stat/comm)
    * Sort dropdown (CPU / MEM / PID / start time / user)
    * Color-coded CPU% (red >=50%, orange >=20%)
    * Color-coded MEM% (red >=10%, orange >=5%)
    * Color-coded STAT (red for zombie)
    * RSS formatted with format_bytes
    * ETIME / TIME formatted as 5d3h / 2h15m / 45s
- _apply_proc_filter() - filter + sort + render in one pass
- _proc_context_menu() - right-click menu:
    * kill (SIGTERM) | kill -9 (SIGKILL) | copy PID | copy cmd |
      filter by this command
- _proc_kill_selected() / _proc_kill() - sends kill over SSH
  with confirmation dialog, shows remote exit code in result
- Splitter: 4 metric cards + proc summary + disk + net on top,
  process list on bottom. User-draggable.

3. New test_process_monitor.py (5 tests, all pass):
- Real SSH connection, collects process data
- Renders MonitorPanel with 200 rows
- Tests search filter / sort change / clear
- Tests killing a real sleep process: starts sleep 60, finds it
  in the table, calls _proc_kill (with QMessageBox monkey-patched
  to auto-yes), verifies remote kill -0 returns 'No such process'
- Also fixed passwords in test_e2e.py + test_terminal.py to match
  the working local sshd credentials

All tests pass: core 6/6 + UI 3/3 + E2E 6/6 + terminal 5/5 + proc 5/5
Build: 57 MB single-file exe.

core/monitor.py

@@ -49,6 +49,20 @@ for iface in $(ls /sys/class/net/ 2>/dev/null | grep -v lo); do
   tx=$(cat /sys/class/net/$iface/statistics/tx_bytes 2>/dev/null || echo 0)
   echo "NET|$iface|$rx|$tx"
 done
+echo "===PROC==="
+# 进程统计
+ps -e -o stat= 2>/dev/null | awk '{r+=($1~/^R/); s+=($1~/^S/); d+=($1~/^D/); z+=($1~/^Z/); t++} END{printf "PROC_TOTAL=%d\nPROC_RUNNING=%d\nPROC_SLEEP=%d\nPROC_DISK=%d\nPROC_ZOMBIE=%d\n", t, r, s, d, z}'
+# 进程列表：etimes/times 都是纯数字，避免 start 字段含 "Jul 21" 多列错位
+# comm 字段可能含空格，前 9 列用 \t 拼，comm 用换行做记录结束
+ps -eo pid,user,pcpu,pmem,vsz,rss,stat,etimes,times,args --sort=-pcpu --no-headers 2>/dev/null \
+  | head -200 \
+  | awk '{
+      out="PROC\t";
+      for(i=1;i<=9;i++) out=out $i "\t";
+      rest="";
+      for(i=10;i<=NF;i++) rest=(i==10?$i:rest " " $i);
+      print out rest
+    }'
 echo "===HOST==="
 echo "HOSTNAME=$(hostname)"
 echo "KERNEL=$(uname -r)"
@@ -70,6 +84,8 @@ echo "OS=$(. /etc/os-release 2>/dev/null && echo "$PRETTY_NAME" || uname -s)"
             "mem_total": 0, "mem_used": 0, "mem_percent": 0.0,
             "swap_total": 0, "swap_used": 0,
             "disks": [], "net": [],
+            "proc_total": 0, "proc_running": 0, "proc_sleep": 0,
+            "proc_disk": 0, "proc_zombie": 0, "processes": [],
             "ts": time.time(),
         }
         if not conn or not conn.connected:
@@ -137,6 +153,47 @@ echo "OS=$(. /etc/os-release 2>/dev/null && echo "$PRETTY_NAME" || uname -s)"
                 except ValueError:
                     continue
 
+        # 进程统计
+        try:
+            result["proc_total"] = int(cls._parse_kv(out, "PROC_TOTAL"))
+            result["proc_running"] = int(cls._parse_kv(out, "PROC_RUNNING"))
+            result["proc_sleep"] = int(cls._parse_kv(out, "PROC_SLEEP"))
+            result["proc_disk"] = int(cls._parse_kv(out, "PROC_DISK"))
+            result["proc_zombie"] = int(cls._parse_kv(out, "PROC_ZOMBIE"))
+        except ValueError:
+            result["proc_total"] = 0
+            result["proc_running"] = 0
+            result["proc_sleep"] = 0
+            result["proc_disk"] = 0
+            result["proc_zombie"] = 0
+
+        # 进程列表（远程用 \t 分隔前 9 列，第 10 列开始是 args/comm，可能含空格）
+        result["processes"] = []
+        for line in out.splitlines():
+            if not line.startswith("PROC\t"):
+                continue
+            payload = line[5:]  # 去掉 "PROC\t" 前缀
+            fields = payload.split("\t", 9)  # 只切前 9 次
+            if len(fields) < 10:
+                continue
+            try:
+                result["processes"].append({
+                    "pid": int(fields[0]),
+                    "user": fields[1],
+                    "pcpu": float(fields[2]),
+                    "pmem": float(fields[3]),
+                    "vsz": int(fields[4]),
+                    "rss": int(fields[5]),
+                    "stat": fields[6],
+                    # etimes: 自启动以来的秒数（整数）
+                    "etime": int(fields[7]) if fields[7].isdigit() else 0,
+                    # times: 累计 CPU 时间秒数
+                    "time": int(fields[8]) if fields[8].isdigit() else 0,
+                    "comm": fields[9].strip(),
+                })
+            except (ValueError, IndexError):
+                continue
+
         return result
 
     @staticmethod