fix: suppression de tous les LIMIT hardcodés dans les requêtes SQL

Supprime les LIMIT arbitraires qui tronquaient silencieusement les résultats:

- analysis.py   : LIMIT 5, 10, 100, 500 (pays ASN, top pays, UAs)
- variability.py: LIMIT 10, 20 (JA4s, pays, ASNs, hosts, UAs)
- fingerprints.py: LIMIT 10, 20, 100 (IPs, UAs, JA4 spoofing)
- entities.py   : LIMIT 100 (IPs associées)
- tcp_spoofing.py: LIMIT 10, 12, 15 (distributions TTL/MSS/window)
- heatmap.py    : LIMIT 15
- search.py     : LIMIT 5 (suggestions de recherche)

Conservés: LIMIT 1 (lookup d'un seul enregistrement) et
LIMIT %(limit)s / OFFSET (pagination contrôlée par le frontend).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/routes/variability.py

@@ -538,7 +538,6 @@ async def get_variability(attr_type: str, value: str):
               AND header_user_agent != '' AND header_user_agent IS NOT NULL
             GROUP BY user_agent
             ORDER BY count DESC
-            LIMIT 20
             """
             ua_result = db.query(ua_query_simple, _ua_params)
             user_agents = [get_attribute_value(row, 1, 2, 3, 4) for row in ua_result.result_rows]
@@ -563,7 +562,6 @@ async def get_variability(attr_type: str, value: str):
               AND ua != ''
             GROUP BY user_agent
             ORDER BY count DESC
-            LIMIT 20
             """
             ua_result = db.query(ua_query_simple, _ua_params)
             user_agents = [get_attribute_value(row, 1, 2, 3, 4) for row in ua_result.result_rows]
@@ -580,7 +578,6 @@ async def get_variability(attr_type: str, value: str):
         WHERE ja4 != '' AND ja4 IS NOT NULL
         GROUP BY ja4
         ORDER BY count DESC
-        LIMIT 10
         """
         
         ja4_result = db.query(ja4_query, {"value": value})
@@ -596,7 +593,6 @@ async def get_variability(attr_type: str, value: str):
         WHERE country_code != '' AND country_code IS NOT NULL
         GROUP BY country_code
         ORDER BY count DESC
-        LIMIT 10
         """
         
         country_result = db.query(country_query, {"value": value})
@@ -613,7 +609,6 @@ async def get_variability(attr_type: str, value: str):
         WHERE asn_number != '' AND asn_number IS NOT NULL AND asn_number != '0'
         GROUP BY asn_display, asn_number
         ORDER BY count DESC
-        LIMIT 10
         """
         
         asn_result = db.query(asn_query, {"value": value})
@@ -636,7 +631,6 @@ async def get_variability(attr_type: str, value: str):
         WHERE host != '' AND host IS NOT NULL
         GROUP BY host
         ORDER BY count DESC
-        LIMIT 10
         """
         
         host_result = db.query(host_query, {"value": value})