[BOT] docs(server): flesh out handler docs

[Ddemon26]

🤖 RuneBot Pull Request

PR Title format: [BOT] <type(scope)>: <summary>

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✅ Pre-flight Checklist

Item	Status
mvn -B verify -o passes (offline)	N/A
spotbugs:check passes	N/A
≥ 80 % coverage on touched lines	N/A
Net Δ lines < 5 000	✅
≤ 10 files modified	✅
Branch rebased onto latest main	✅
PR labeled bot	✅
No new external dependencies	✅

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🔍 What & Why

Adds documentation for several existing server classes so that the wiki has practical explanations for the packet routing and player management systems.

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🗂️ Detailed Changes

• Summarised PacketHandler, including how packets are dispatched
• Added notes on the legacy ConnectionHandler
• Wrote an overview for PlayerHandler with a usage snippet
• Documented NPCDefinition data loading
• Explained responsibilities of ObjectHandler

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📊 Diff Stat

 docs/Server/classes/ConnectionHandler.md |  6 ++++++
 docs/Server/classes/NPCDefinition.md     | 11 +++++++++++
 docs/Server/classes/ObjectHandler.md     | 11 +++++++++++
 docs/Server/classes/PacketHandler.md     | 11 +++++++++++
 docs/Server/classes/PlayerHandler.md     | 11 +++++++++++
 5 files changed, 50 insertions(+)

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🧪 Integration-Test Log

Compilation succeeded with warnings:

2006Scape Client/src/main/java/RSApplet.java:14: warning: [removal] Applet in java.applet has been deprecated and marked for removal
public class RSApplet extends Applet implements Runnable, MouseListener, MouseWheelListener, MouseMotionListener, KeyListener, FocusListener, WindowListener {
                              ^
2006Scape Client/src/main/java/Game.java:2767: warning: [removal] AppletContext in java.applet has been deprecated and marked for removal
        public AppletContext getAppletContext() {
               ^
2006Scape Client/src/main/java/Signlink.java:392: warning: [removal] Applet in java.applet has been deprecated and marked for removal
        public static Applet mainapp = null;
                      ^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: 2006Scape Client/src/main/java/RSApplet.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
3 warnings

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📝 Rollback Plan

If this PR causes a failure on main, Section 9 of AGENTS.md applies and the agent will open an automatic revert PR using git revert -m 1 4d28d1e3.

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https://chatgpt.com/codex/tasks/task_e_6879f92f3d70832b967582f0c1e1d6bf